💻 Language switcher text (#5309)

Fixes #4835 

[Babel](https://www.unicode.org/cldr/charts/44/supplemental/territory_language_information.html) only lists language codes in Latin alphabet. I did some searching and I think it would be quite difficult to find the non Latin language codes. So for the non Latin languages, I thought the best solution would be to just state the _non Latin language_ in the switcher instead of the _non Latin language code._ 

**How to test**
1. Select a non latin language in your profile
2. Go to Hedy
3. Check if there is a language in the switcher (and it's not None)
4. Switch between English and the (non Latin) language

https://github.com/hedyorg/hedy/assets/48122190/73adcb1c-fefb-42f3-958d-3876dbf6eb7b

app.py

@@ -12,6 +12,7 @@
 import sys
 import traceback
 import textwrap
+import unicodedata
 import zipfile
 import jinja_partials
 from typing import Optional
@@ -414,6 +415,9 @@ def setup_language():
     # front-end is fixed based on this value
     g.dir = static_babel_content.TEXT_DIRECTIONS.get(g.lang, 'ltr')
 
+    # True if it is a Latin alphabet, False if not
+    g.latin = all('LATIN' in unicodedata.name(char, '').upper() for char in current_language()['sym'])
+
     # Check that requested language is supported, otherwise return 404
     if g.lang not in ALL_LANGUAGES.keys():
         return "Language " + g.lang + " not supported", 404

templates/level-page.html

@@ -117,7 +117,7 @@ <h2 class="px-2 py-6">{{_('cheatsheet_title')}}</h2>
       <div class="dropdown relative">
         <button class="green-btn font-semibold rounded inline-flex items-center gap-2 mr-2"
           onclick="$('#commands_dropdown').slideToggle('medium');" data-cy="kwlang-switch-btn">
-          <span class="fa-solid fa-language"></span>
+          {% if not g.latin and g.keyword_lang != "en" %}{{ current_language().sym }}{% else %}{{current_keyword_language().lang}}{% endif %}
           <svg id="keyword-arrow" class="fill-current h-6 w-6" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20">
             <path d="M9.293 12.95l.707.707L15.657 8l-1.414-1.414L10 10.828 5.757 6.586 4.343 8z" />
           </svg>