Update Norwegian translations (#2937)

* Update Norwegian translations

* Updated no.json
* Updated activerecord.no.yml
* Updated no.yml
* Updated simple_form.no.yml

* i18n: fix Unicode character error in no.yml

* Javascript escaping code "\uD83D\uDC18" should be "\U0001f418" in
Ruby / yml

* i18n: remove unused keys in Norwegian translation

* Remove unused keys in no.yml and activerecord.no.yml
  by running: `bundle exec i18n-tasks remove-unused no`

* Add missing keys in activerecord.no.yml and no.yml by
  running: `bundle exec i18n-tasks add-missing no`

* i18n: escape the key 'no' in activerecord.no.yml

config/locales/activerecord.no.yml

@@ -0,0 +1,13 @@
+---
+'no':
+  activerecord:
+    errors:
+      models:
+        account:
+          attributes:
+            username:
+              invalid: bare bokstaver, tall og understreker
+        status:
+          attributes:
+            reblog:
+              taken: av status eksisterer allerede