add a Ukrainian language (#4036)

custom/conf/app.ini.sample

@@ -568,8 +568,8 @@ ENABLE_SWAGGER_ENDPOINT = true
 MAX_RESPONSE_ITEMS = 50
 
 [i18n]
-LANGS = en-US,zh-CN,zh-HK,zh-TW,de-DE,fr-FR,nl-NL,lv-LV,ru-RU,ja-JP,es-ES,pt-BR,pl-PL,bg-BG,it-IT,fi-FI,tr-TR,cs-CZ,sr-SP,sv-SE,ko-KR
-NAMES = English,简体中文,繁體中文（香港）,繁體中文（台灣）,Deutsch,français,Nederlands,latviešu,русский,日本語,español,português do Brasil,polski,български,italiano,suomi,Türkçe,čeština,српски,svenska,한국어
+LANGS = en-US,zh-CN,zh-HK,zh-TW,de-DE,fr-FR,nl-NL,lv-LV,ru-RU,uk-UA,ja-JP,es-ES,pt-BR,pl-PL,bg-BG,it-IT,fi-FI,tr-TR,cs-CZ,sr-SP,sv-SE,ko-KR
+NAMES = English,简体中文,繁體中文（香港）,繁體中文（台灣）,Deutsch,français,Nederlands,latviešu,русский,Українська,日本語,español,português do Brasil,polski,български,italiano,suomi,Türkçe,čeština,српски,svenska,한국어
 
 [U2F]
 ; Two Factor authentication with security keys
@@ -590,6 +590,7 @@ fr-FR = fr
 nl-NL = nl
 lv-LV = lv
 ru-RU = ru
+uk-UA = uk
 ja-JP = ja
 es-ES = es
 pt-BR = pt-BR