i18n: Add new languages from Transifex: eu (Basque), yue (Cantonese)

None of the strings are translated, so not time to offer these in
the UI yet. But perhaps soon!

Author: chrisbobbe

flow-typed/translations.js

@@ -76,6 +76,10 @@ declare module '../../static/translations/messages_es.json' {
   declare export default {| [string]: string |};
 }
 
+declare module '../../static/translations/messages_eu.json' {
+  declare export default {| [string]: string |};
+}
+
 declare module '../../static/translations/messages_fa.json' {
   declare export default {| [string]: string |};
 }
@@ -244,6 +248,10 @@ declare module '../../static/translations/messages_vi.json' {
   declare export default {| [string]: string |};
 }
 
+declare module '../../static/translations/messages_yue.json' {
+  declare export default {| [string]: string |};
+}
+
 declare module '../../static/translations/messages_zh-Hans.json' {
   declare export default {| [string]: string |};
 }

src/i18n/messagesByLanguage.js

@@ -29,6 +29,7 @@ export default {
   'en-GB': require('../../static/translations/messages_en_GB.json'),
   eo: require('../../static/translations/messages_eo.json'),
   es: require('../../static/translations/messages_es.json'),
+  eu: require('../../static/translations/messages_eu.json'),
   fa: require('../../static/translations/messages_fa.json'),
   fi: require('../../static/translations/messages_fi.json'),
   fr: require('../../static/translations/messages_fr.json'),
@@ -71,6 +72,7 @@ export default {
   ur: require('../../static/translations/messages_ur.json'),
   uz: require('../../static/translations/messages_uz.json'),
   vi: require('../../static/translations/messages_vi.json'),
+  yue: require('../../static/translations/messages_yue.json'),
   'zh-Hans': require('../../static/translations/messages_zh-Hans.json'),
   'zh-Hant': require('../../static/translations/messages_zh-Hant.json'),
   'zh-TW': require('../../static/translations/messages_zh_TW.json'),