Merge pull request DSpace#2001 from michdyk/DS1931---Polish-Translation

Ds1931   polish translation

Author: tdonohue

config/config.example.yml

@@ -175,6 +175,10 @@ languages:
   - code: uk
     label: Yкраї́нська
     active: true
+  - code: pl
+    label: Polski
+    active: true
+
 
 # Browse-By Pages
 browseBy: