New translations en.json (Russian)

i18n/ru.json

@@ -227,5 +227,5 @@
     "Link copied to clipboard": "Ссылка скопирована в буфер обмена",
     "Paste text": "Paste text",
     "Tabulator key serves as character (Hit <kbd>Ctrl</kbd>+<kbd>m</kbd> or <kbd>Esc</kbd> to toggle)": "Tabulator key serves as character (Hit <kbd>Ctrl</kbd>+<kbd>m</kbd> or <kbd>Esc</kbd> to toggle)",
-    "Theme": "Theme"
+    "Theme": "Тема"
 }