Merge pull request #4541 from DSpace/backport-4487-to-dspace-9_x

[Port dspace-9_x] Russian translation

Author: tdonohue

config/config.example.yml

@@ -307,6 +307,9 @@ languages:
   - code: pt-BR
     label: Português do Brasil
     active: true
+  - code: ru
+    label: Русский
+    active: true
   - code: sr-lat
     label: Srpski (lat)
     active: true