Release v0.9.0

Added

• Added new utility utils.translation_helper.TranslationHelper.
• Added several new TypedDict types to translator_typing.
• Added Translator.translate overloads. Catch-all overload for reverse=True.
• Added many new in-line examples to class, function and module docstrings. Updated and corrected or clarified several
  docstrings which were poorly worded or outdated.

Changed

• Methods Translator.fetch() and go_offline() now expose arguments (such as
  maximal_untranslated_fraction) that were previously limited to translate().
• Improve when a maximal_untranslated_fraction is in use.
• The Format class is now callable for convenience (keyword only).

Fixed

• Return copy in TranslationMap.name_to_source - consistent with similar properties.
• Handle dict names properly in Translator.fetch() and go_offline().
• Untranslated IDs should now never be None - ensure a valid Format is always available.
• Raise ValueError when using positional placeholders in Format. This used to be a silent error.