[Feature] Improve legal code language selection/fallback

[TimidRobot]

Problem

The language selection/fallback for Deeds & UX is robust:

1. https://github.com/creativecommons/cc-legal-tools-app/blob/1906900d05b00367024c05b92f8b103c5044e9d7/i18n/utils.py#L307C1-L335

2. cc-legal-tools-app/i18n/utils.py

   Lines 256 to 263 in 1906900

   	def get_default_language_for_jurisdiction_deed(jurisdiction_code):
   	default_language = DEFAULT_JURISDICTION_LANGUAGES.get(
   	jurisdiction_code, settings.LANGUAGE_CODE
   	)
   	if default_language in settings.LANGUAGES_MOSTLY_TRANSLATED:
   	return default_language
   	else:
   	return settings.LANGUAGE_CODE

However, logic for the legal code translation domains use a naive version:

1. cc-legal-tools-app/i18n/utils.py

   Lines 266 to 269 in 1906900

   	def get_default_language_for_jurisdiction_naive(jurisdiction_code):
   	return DEFAULT_JURISDICTION_LANGUAGES.get(
   	jurisdiction_code, settings.LANGUAGE_CODE
   	)

Description

1. Add a new function (ex. load_legal_code_translations()) that populate a new variable (ex. settings.LANGUAGES_AVAILABLE_LEGAL_CODE)
   • (much like the load_deeds_ux_translations() function)
2. get_default_language_for_jurisdiction_naive() -> get_default_language_for_jurisdiction_legal_code()
   • The get_default_language_for_jurisdiction_naive() function should be replaced with a get_default_language_for_jurisdiction_legal_code() function
   • The new function should rely on a setting variable (ex. settings.LANGUAGES_AVAILABLE_LEGAL_CODE)
     • (much like the get_default_language_for_jurisdiction_deed() function relies on settings.LANGUAGES_MOSTLY_TRANSLATED)
3. get_default_language_for_jurisdiction_deed() -> get_default_language_for_jurisdiction_deed_ux()
   • The get_default_language_for_jurisdiction_deed() function should be renamed to get_default_language_for_jurisdiction_deed_ux()
   • (the scope is the Deeds & UX translation domain, not specifically the deeds)
4. settings.LANGUAGES_MOSTLY_TRANSLATED -> settings.LANGUAGES_AVAILABLE_DEEDS_UX
   • The settings.LANGUAGES_MOSTLY_TRANSLATED variable should be rename to settings.LANGUAGES_AVAILABLE_DEEDS_UX
   • (the scope is the Deeds & UX translation domain, not specifically the deeds)

Additional context

• App: Fix missing canonical URLs #446
  • (added the get_default_language_for_jurisdiction_naive() function)

Implementation

• I would be interested in implementing this feature.