Fixed the "Invalid SID" error for YandexTranslate service.

• fix: Offline translation does not work in new version by @vitonsky in https://github.com/translate-tools/linguist/pull/579
• fix: Uncaught Error when automatically translating new content by @vitonsky in https://github.com/translate-tools/linguist/pull/580
• fix: Translation service must check supported languages and throw invalid requests by @vitonsky in https://github.com/translate-tools/linguist/pull/581

Full Changelog: https://github.com/translate-tools/linguist/compare/v7.0.2...v7.0.3

fix: Hotfix for selected text translation button appearance - https://github.com/translate-tools/linguist/pull/570

- Custom translators code now run in sandboxed iframe with no access to addon API
- New option to disable translation history recording
- Minor bug fixes and improvements

Full Changelog: https://github.com/translate-tools/linguist/compare/v5.0.17...6.0.1

Implemented reproducible build

- English grammar improvements by @krisdoodle45
- Now translate button will not annoyed you while press to copy buttons

Now [custom translators](https://github.com/translate-tools/linguist/blob/master/docs/CustomTranslator.md) are available. You can use any translation service with linguist, even local deployed API.

# Changes
- custom translators
- improvements in selected text translation UI on smartphones
- enable translation button for all text inputs
- switch languages button now don't disable while translation process
- hide language suggestions for unsupported languages
- bug fixes and UX improvements