added translation for ru-RU (#1234)

feat: added translation for ru-RU

frontend/app_flowy/packages/appflowy_editor/lib/l10n/intl_ru_RU.arb

@@ -1,35 +1,35 @@
 {
   "@@locale": "ru-RU",
-  "bold": "",
+  "bold": "смелый",
   "@bold": {},
-  "bulletedList": "",
+  "bulletedList": "маркированный список",
   "@bulletedList": {},
-  "checkbox": "",
+  "checkbox": "флажок",
   "@checkbox": {},
-  "embedCode": "",
+  "embedCode": "код для вставки",
   "@embedCode": {},
-  "heading1": "",
+  "heading1": "заголовок1",
   "@heading1": {},
-  "heading2": "",
+  "heading2": "заголовок2",
   "@heading2": {},
-  "heading3": "",
+  "heading3": "заголовок3",
   "@heading3": {},
-  "highlight": "",
+  "highlight": "выделять",
   "@highlight": {},
-  "image": "",
+  "image": "изображение",
   "@image": {},
-  "italic": "",
+  "italic": "курсив",
   "@italic": {},
-  "link": "",
+  "link": "ссылка на сайт",
   "@link": {},
-  "numberedList": "",
+  "numberedList": "нумерованный список",
   "@numberedList": {},
-  "quote": "",
+  "quote": "цитировать",
   "@quote": {},
-  "strikethrough": "",
+  "strikethrough": "зачеркнутый",
   "@strikethrough": {},
-  "text": "",
+  "text": "текст",
   "@text": {},
-  "underline": "",
+  "underline": "подчеркнуть",
   "@underline": {}
 }