Catalan translation update (#3177)

* Add Catalan language

* Add Catalan language

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update settings_helper.rb

* Update mastodon.js

* Update index.js

* Update application.rb

* Update ca.yml

* removed extra spaces at line 225

* Catalan translation update

added activerecord.ca.yml

* Update activerecord.ca.yml

Done

* Updated activerecord.ca.yml

config/locales/activerecord.ca.yml

@@ -0,0 +1,12 @@
+ca:
+  activerecord:
+    errors:
+      models:
+        account:
+          attributes:
+            username:
+              invalid: només lletres, números i subratllats
+        status:
+          attributes:
+            reblog:
+              taken: del estat ja existeix