code: def _find_lang(langdict, lang, script, region):
      
      # Check if we should map this to a different locale.
      full_locale = _full_locale(lang, script, region)
      if (full_locale in _LOCALE_NORMALIZATION_MAP and
          _LOCALE_NORMALIZATION_MAP[full_locale] in langdict):
          return langdict[_LOCALE_NORMALIZATION_MAP[full_locale]]
      # First look for the full locale
      if full_locale in langdict:
          return langdict[full_locale]
      # Then look for lang, script as a combination
      if script is not None:
          lang_script = "%s_%s" % (lang, script)
          if lang_script in langdict:
              return langdict[lang_script]
      # Next look for lang, region as a combination
      if region is not None:
          lang_region = "%s_%s" % (lang, region)
          if lang_region in langdict:
              return langdict[lang_region]
      # Fall back to bare language code lookup
      if lang in langdict:
          return langdict[lang]
      # Possibly fall back to english
      if _may_fall_back_to_english(lang):
          return langdict.get("en", None)
      else:
          return None
docs: Return the entry in the dictionary for the given language information.