menu: update the language menu entry

In the menu of the public interface, it exists a 'menu' entry. This
entry list all available languages for the application. This commit
renamed the entry menu using the current language and change the icon
linked to this menu entry

Closes #1466

Co-Authored-by: Renaud Michotte <renaud.michotte@gmail.com>

rero_ils/views.py

@@ -148,16 +148,17 @@ def init_menu_tools():
 def init_menu_lang():
     """Create the header language menu."""
     item = current_menu.submenu('main.menu')
+    ui_language = 'ui_language_{lang}'.format(lang=current_i18n.language)
     # Bug: when you reload the page with register(**kwargs), it failed
     # We so check that 'id' already exists. If yes, do not create again
     # the item.
     rero_register(
         item,
         endpoint=None,
         text='{icon} <span class="{visible}">{menu}'.format(
-            icon='<i class="fa fa-bars"></i>',
+            icon='<i class="fa fa-language"></i>',
             visible='visible-md-inline visible-lg-inline',
-            menu=_('Menu')
+            menu=_(ui_language)
         ),
         order=0,
         id='language-menu'