Add Scottish Gaelic as translation

spec/config/i18n.spec.ts

@@ -2,7 +2,7 @@ import * as path from 'path'
 import fs from 'fs'
 import keys from 'all-object-keys'
 
-const locales = ['de', 'fr', 'it', 'ja', 'ko', 'pl', 'it', 'zh_cn', 'zh_tw', 'cs', 'es_es', 'no', 'pt_pt', 'ru', 'si', 'sv_se', 'tzm']
+const locales = ['de', 'fr', 'gd', 'it', 'ja', 'ko', 'pl', 'it', 'zh_cn', 'zh_tw', 'cs', 'es_es', 'no', 'pt_pt', 'ru', 'si', 'sv_se', 'tzm']
 
 describe('i18n', () => {
   describe('should not define duplicate keys', () => {

src/config/i18n.ts

@@ -4,6 +4,7 @@ import de from '~/src/config/locales/de/translation.json'
 import en from '~/src/config/locales/en/translation.json'
 import es_es from '~/src/config/locales/es_es/translation.json'
 import fr from '~/src/config/locales/fr/translation.json'
+import gd from '~/src/config/locales/gd/translation.json'
 import id from '~/src/config/locales/id/translation.json'
 import it from '~/src/config/locales/it/translation.json'
 import ja from '~/src/config/locales/ja/translation.json'
@@ -39,6 +40,9 @@ const options: InitOptions = {
     fr: {
       translation: fr
     },
+    gd: {
+      translation: gd
+    },
     id: {
       translation: id
     },

src/constants/language/index.d.ts

@@ -8,6 +8,7 @@ export type LanguageList = {
   de: LanguageType
   en: LanguageType
   fr: LanguageType
+  gd: LanguageType
   ja: LanguageType
   ko: LanguageType
   pl: LanguageType

src/constants/language/index.js

@@ -14,6 +14,11 @@ export default {
     key: 'fr',
     rfc4646: 'fr'
   },
+  gd: {
+    name: 'Gàidhlig',
+    key: 'gd',
+    rfc4646: 'gd'
+  },
   ja: {
     name: '日本語',
     key: 'ja',

src/renderer/components/Preferences/Language.vue

@@ -43,6 +43,7 @@ export default {
         Language.en,
         Language.es_es,
         Language.fr,
+        Language.gd,
         Language.id,
         Language.it,
         Language.ja,