✨ Add new locale picker and related improvements

Closes: #583

config/_default/languages.en.toml

@@ -1,15 +1,12 @@
 languageCode = "en"
 languageName = "English"
+languageDirection = "ltr"
 weight = 1
 
 title = "Congo"
 # copyright = "Copy, _right?_ :thinking_face:"
 
 [params]
-  isoCode = "en"
-  displayName = "EN"
-  rtl = false
-
   dateFormat = "2 January 2006"
 
   # mainSections = ["section1", "section2"]

config/_default/menus.en.toml

@@ -31,6 +31,12 @@
   [main.params]
     action = "search"
 
+[[main]]
+  identifier = "locale"
+  weight = 100
+  [main.params]
+    action = "locale"
+
 # -- Footer Menu --
 # The footer menu is displayed at the bottom of the page, just before
 # the copyright notice. Configure as per the main menu above.