Translation Laravel Versions Save

Fixes (bugs & defects):

• Bump gettext/gettext dependency to fix GetText parsing with Blade Component Tags (cf. #17 and https://github.com/php-gettext/Gettext/pull/261)

Fixes (bugs & defects):

• Relax Guzzle dependency to work with Laravel 8

New features:

• Compatibility with Laravel 8

New features:

• Compatibility with Laravel 7 and PHP 7.4

New features:

• Add ignored_key_prefixes option (documentation).
• Better API request error management.

Fixes (bugs & defects):

• gettext_parse_paths and gettext_locales_path are now optional and will use the default values if not specified.

Fixes (bugs & defects):

• Don't crash on sync when locale files don't contain a specific key for source editions, thanks @lsmith77

New features:

• Laravel 6 compatibility (#14)

Fixes (bugs & defects):

• Default locale independent to translation setup (PR #9), thanks @nikosv
• Improve readability of target language JSON files by not escaping unicode chars or slashes.

Fixes (bugs & defects):

• Increase the compatibility with Laravel 5.1 (maybe less).

Fixes (bugs & defects):

• Fix important bug that didn't detect some existing translations when php artisan translation:init a new already-translated project.