feat(admin/user): new get user language and sort tabs (#1026)

dev/core-bundle/twig/core.md

@@ -84,7 +84,7 @@ This filter replaces the filter `|data_label`.
 
 Context for the expression: 
 - rawData: array containing the rawData from document or revision
-- userLocale: the preferred locale of the user, fallback environment variable `EMSCO_FALLBACK_LOCALE`
+- userLocale: the preferred language of the user, default 'en'
 
 ```twig
 {# Print the label in the users preferred locale, fallback to label_fr #}

upgrade.md

@@ -11,6 +11,20 @@
   * [version 4.x](#version-4x)
   * [Tips and tricks](#tips-and-tricks)
 
+## version 5.22.x
+
+* Removed environment variable: `EMSCO_FALLBACK_LOCALE`
+* Add new method `getLanguage` on user object
+
+  preferred locale 'nl_FR' returns 'nl'
+  ```twig
+  {% set language = app.user.localePreferred[0:2] %} //before 
+  {% set language = app.user.language %} //now
+  
+  {# sort based on user language #}
+  {% set languages = ['fr', 'nl']|sort((a, b) => a == app.user.language ? -1 : b == app.user.language ? 1 : 0) %}
+  ```
+
 ## version 5.21.x
 
 * Core twig component Media library: Removed the option `fieldPathOrder`, use new option `sort` (defining all possible sorts)