diff --git a/package-lock.json b/package-lock.json
index 09f00bbb6..d0dee325c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1263,7 +1263,7 @@
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         "file-type": {
           "version": "3.9.0",
-          "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+          "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
           "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
         }
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@@ -1539,7 +1539,7 @@
         },
         "uuid": {
           "version": "2.0.3",
-          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
           "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho="
         }
       }
@@ -1573,7 +1573,7 @@
       "dependencies": {
         "semver": {
           "version": "4.3.6",
-          "resolved": "http://registry.npmjs.org/semver/-/semver-4.3.6.tgz",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-4.3.6.tgz",
           "integrity": "sha1-MAvG4OhjdPe6YQaLWx7NV/xlMto="
         }
       }
@@ -1593,7 +1593,7 @@
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     "bl": {
       "version": "1.2.2",
-      "resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
       "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
       "requires": {
         "readable-stream": "^2.3.5",
@@ -1853,12 +1853,12 @@
       "dependencies": {
         "file-type": {
           "version": "3.9.0",
-          "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+          "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
           "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
         },
         "uuid": {
           "version": "2.0.3",
-          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
           "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho="
         }
       }
@@ -1963,7 +1963,7 @@
         },
         "readable-stream": {
           "version": "1.1.14",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
           "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
           "requires": {
             "core-util-is": "~1.0.0",
@@ -2138,7 +2138,7 @@
     },
     "chalk": {
       "version": "1.1.3",
-      "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
       "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
       "requires": {
         "ansi-styles": "^2.2.1",
@@ -2455,7 +2455,7 @@
     },
     "commander": {
       "version": "2.8.1",
-      "resolved": "http://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
       "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
       "requires": {
         "graceful-readlink": ">= 1.0.0"
@@ -3118,7 +3118,7 @@
         },
         "readable-stream": {
           "version": "1.1.14",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
           "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
           "requires": {
             "core-util-is": "~1.0.0",
@@ -3332,9 +3332,9 @@
       "integrity": "sha512-IncmUpn1yN84hy2shb0POJ80FWrfGNY0cxO9f4v+/sG7qcBvAtVWUA1IdzY/8EYUmOVhoKJVdJjNd3AZcnxOjA=="
     },
     "electron": {
-      "version": "9.0.0-beta.17",
-      "resolved": "https://registry.npmjs.org/electron/-/electron-9.0.0-beta.17.tgz",
-      "integrity": "sha512-EDBN2ana6gQMsijOICCQc7XYaYOd9UmJlHX1aONy2+VycomPRzkh4E2J23bJ0L4VO5RGn1FTRBof/GXd2F0NKQ==",
+      "version": "9.0.0-beta.18",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-9.0.0-beta.18.tgz",
+      "integrity": "sha512-mOdPB4nPc4kO2uwpvvbNZz0RDrRDIko/C8XFmOZmz7k3JaU7r0h/tLxdeypiqfLwxW/Bu1n+uwqG1X34i3fTEw==",
       "dev": true,
       "requires": {
         "@electron/get": "^1.0.1",
@@ -4936,7 +4936,7 @@
     },
     "get-stream": {
       "version": "3.0.0",
-      "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
       "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
     },
     "getpass": {
@@ -5200,7 +5200,7 @@
     },
     "got": {
       "version": "5.7.1",
-      "resolved": "http://registry.npmjs.org/got/-/got-5.7.1.tgz",
+      "resolved": "https://registry.npmjs.org/got/-/got-5.7.1.tgz",
       "integrity": "sha1-X4FjWmHkplifGAVp6k44FoClHzU=",
       "requires": {
         "create-error-class": "^3.0.1",
@@ -5848,7 +5848,7 @@
     },
     "into-stream": {
       "version": "3.1.0",
-      "resolved": "http://registry.npmjs.org/into-stream/-/into-stream-3.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/into-stream/-/into-stream-3.1.0.tgz",
       "integrity": "sha1-lvsKk2wSur1v8XUqF9BWFqvQlMY=",
       "requires": {
         "from2": "^2.1.1",
@@ -6000,7 +6000,7 @@
     },
     "is-obj": {
       "version": "1.0.1",
-      "resolved": "http://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
       "integrity": "sha1-PkcprB9f3gJc19g6iW2rn09n2w8="
     },
     "is-object": {
@@ -6551,7 +6551,7 @@
     },
     "load-json-file": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
       "integrity": "sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=",
       "requires": {
         "graceful-fs": "^4.1.2",
@@ -7060,7 +7060,7 @@
     },
     "minimist": {
       "version": "1.2.0",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
       "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
     },
     "minipass": {
@@ -7160,7 +7160,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "requires": {
         "minimist": "0.0.8"
@@ -7168,7 +7168,7 @@
       "dependencies": {
         "minimist": {
           "version": "0.0.8",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
           "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
         }
       }
@@ -7362,7 +7362,7 @@
             },
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             },
             "got": {
@@ -7398,7 +7398,7 @@
             },
             "p-cancelable": {
               "version": "0.4.1",
-              "resolved": "http://registry.npmjs.org/p-cancelable/-/p-cancelable-0.4.1.tgz",
+              "resolved": "https://registry.npmjs.org/p-cancelable/-/p-cancelable-0.4.1.tgz",
               "integrity": "sha512-HNa1A8LvB1kie7cERyy21VNeHb2CWJJYqyyC2o3klWFfMGlFmWv2Z7sFgZH8ZiaYL95ydToKTFVXgMV/Os0bBQ=="
             },
             "p-event": {
@@ -7522,7 +7522,7 @@
           "dependencies": {
             "file-type": {
               "version": "3.9.0",
-              "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+              "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
               "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
             }
           }
@@ -7547,7 +7547,7 @@
           "dependencies": {
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             },
             "pify": {
@@ -7604,7 +7604,7 @@
         },
         "get-stream": {
           "version": "2.3.1",
-          "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-2.3.1.tgz",
+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-2.3.1.tgz",
           "integrity": "sha1-Xzj5PzRgCWZu4BUKBUFn+Rvdld4=",
           "requires": {
             "object-assign": "^4.0.1",
@@ -7634,7 +7634,7 @@
           "dependencies": {
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             }
           }
@@ -7674,7 +7674,7 @@
         },
         "pify": {
           "version": "2.3.0",
-          "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
           "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw="
         },
         "prepend-http": {
@@ -7779,7 +7779,7 @@
         },
         "readable-stream": {
           "version": "1.1.14",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
           "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
           "requires": {
             "core-util-is": "~1.0.0",
@@ -8148,7 +8148,7 @@
     },
     "onetime": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
       "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k="
     },
     "open": {
@@ -8300,7 +8300,7 @@
     },
     "p-is-promise": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz",
       "integrity": "sha1-nJRWmJ6fZYgBewQ01WCXZ1w9oF4="
     },
     "p-limit": {
@@ -8781,7 +8781,7 @@
             },
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             }
           }
@@ -9065,7 +9065,7 @@
           "dependencies": {
             "file-type": {
               "version": "3.9.0",
-              "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+              "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
               "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
             }
           }
@@ -9090,7 +9090,7 @@
           "dependencies": {
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             },
             "pify": {
@@ -9128,7 +9128,7 @@
             },
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             }
           }
@@ -9180,7 +9180,7 @@
         },
         "get-stream": {
           "version": "2.3.1",
-          "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-2.3.1.tgz",
+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-2.3.1.tgz",
           "integrity": "sha1-Xzj5PzRgCWZu4BUKBUFn+Rvdld4=",
           "requires": {
             "object-assign": "^4.0.1",
@@ -9210,7 +9210,7 @@
           "dependencies": {
             "get-stream": {
               "version": "3.0.0",
-              "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+              "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
               "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
             }
           }
@@ -9398,7 +9398,7 @@
     },
     "query-string": {
       "version": "5.1.1",
-      "resolved": "http://registry.npmjs.org/query-string/-/query-string-5.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/query-string/-/query-string-5.1.1.tgz",
       "integrity": "sha512-gjWOsm2SoGlgLEdAGt7a6slVOk9mGiXmPFMqrEhLQ68rhQuBnpfs3+EmlvqKyxnCo9/PPlF+9MtY02S1aFg+Jw==",
       "requires": {
         "decode-uri-component": "^0.2.0",
@@ -9537,7 +9537,7 @@
     },
     "readable-stream": {
       "version": "2.3.6",
-      "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
       "requires": {
         "core-util-is": "~1.0.0",
@@ -10405,7 +10405,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "requires": {
         "ansi-regex": "^2.0.0"
@@ -10430,7 +10430,7 @@
     },
     "strip-dirs": {
       "version": "1.1.1",
-      "resolved": "http://registry.npmjs.org/strip-dirs/-/strip-dirs-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-dirs/-/strip-dirs-1.1.1.tgz",
       "integrity": "sha1-lgu9EoeETzl1pFWKoQOoJV4kVqA=",
       "requires": {
         "chalk": "^1.0.0",
@@ -10688,7 +10688,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
     },
     "through2": {
@@ -10707,7 +10707,7 @@
         },
         "readable-stream": {
           "version": "1.0.34",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
           "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
           "requires": {
             "core-util-is": "~1.0.0",
diff --git a/package.json b/package.json
index 2353bb42f..343ced10b 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "yazl": "^2.5.1"
   },
   "devDependencies": {
-    "electron": "9.0.0-beta.17",
+    "electron": "9.0.0-beta.18",
     "electron-builder": "22.5.1",
     "electron-packager": "14.2.1",
     "electron-rebuild": "1.10.1",
diff --git a/src/public/app/dialogs/options/other.js b/src/public/app/dialogs/options/other.js
index b2b2a7050..9a962bc6f 100644
--- a/src/public/app/dialogs/options/other.js
+++ b/src/public/app/dialogs/options/other.js
@@ -1,4 +1,4 @@
-import optionsService from "../../services/options.js";
+import utils from "../../services/utils.js";
 import server from "../../services/server.js";
 import toastService from "../../services/toast.js";
 
@@ -20,7 +20,9 @@ const TPL = `
         <input type="text" class="form-control" id="spell-check-language-code" placeholder="for example &quot;en-US&quot;, &quot;de-AT&quot;">
     </div>
 
-    <p>Multiple languages can be separated by comman. Changes to the spell check options will take effect after application restart.</p>
+    <p>Multiple languages can be separated by comma, e.g. <code>en-US, de-DE, cs</code>. Changes to the spell check options will take effect after application restart.</p>
+    
+    <p><strong>Available language codes: </strong> <span id="available-language-codes"></span></p>
 </div>
 
 <div>
@@ -95,6 +97,14 @@ export default class ProtectedSessionOptions {
             return false;
         });
 
+        this.$availableLanguageCodes = $("#available-language-codes");
+
+        if (utils.isElectron()) {
+            const {webContents} = utils.dynamicRequire('electron').remote.getCurrentWindow();
+
+            this.$availableLanguageCodes.text(webContents.session.availableSpellCheckerLanguages.join(', '));
+        }
+
         this.$eraseNotesAfterTimeInSeconds = $("#erase-notes-after-time-in-seconds");
 
         this.$eraseNotesAfterTimeInSeconds.on('change', () => {
diff --git a/src/services/window.js b/src/services/window.js
index 098e1b864..22a1277ff 100644
--- a/src/services/window.js
+++ b/src/services/window.js
@@ -68,7 +68,7 @@ async function createMainWindow() {
 
     if (spellcheckEnabled) {
         const languageCodes = (await optionService.getOption('spellCheckLanguageCode'))
-            .split('/')
+            .split(',')
             .map(code => code.trim());
 
         webContents.session.setSpellCheckerLanguages(languageCodes);