feat(spellcheck): add Ukrainian language for spellcheck (#1382)

src/browser/components/SettingsPage.jsx

@@ -714,7 +714,7 @@ export default class SettingsPage extends React.Component {
         {'Check spelling'}
         <HelpBlock>
           {'Highlight misspelled words in your messages.'}
-          {' Available for English, French, German, Portuguese, Russian, Spanish, and Dutch.'}
+          {' Available for English, French, German, Portuguese, Russian, Ukrainian, Spanish, and Dutch.'}
         </HelpBlock>
       </Checkbox>);
 

src/browser/js/contextMenu.js

@@ -30,6 +30,7 @@ function getSpellCheckerLocaleMenus(onSelectSpellCheckerLocale) {
     {language: 'Polish', locale: 'pl-PL'},
     {language: 'Portuguese (BR)', locale: 'pt-BR'},
     {language: 'Russian', locale: 'ru-RU'},
+    {language: 'Ukrainian', locale: 'uk-UA'},
     {language: 'Spanish (ES)', locale: 'es-ES'},
     {language: 'Spanish (MX)', locale: 'es-MX'},
     {language: 'Dutch', locale: 'nl-NL'},

src/main/SpellChecker.js

@@ -119,5 +119,8 @@ SpellChecker.getSpellCheckerLocale = (electronLocale) => {
   if (electronLocale.match(/^ru-?/)) {
     return 'ru-RU';
   }
+  if (electronLocale.match(/^uk-?/)) {
+    return 'uk-UA';
+  }
   return 'en-US';
 };