Content translation provides mechanisms to encourage users to review the initial content that gets added to the translation such as errors (T190283) and warnings (T190279). These mechanisms apply when the user uses machine translation or the source content as an initial content (i.e., when "Use source text" or "Use Apertium/Yandex/X" from the Automatic translation card options is applied).
However, these mechanisms should not apply to cases where the content is initiated by the user such as when the "Don't use machine translation" option is selected and the user types content or pastes it from the clipboard. We should make sue that we are not counting that content as unreviewed, and that it does not block users from publishing.
**Steps to reproduce:**
1. On ContentTranslation page start translating and make 'Don't use machine translation' option as default.
2. Copy some text (from somewhere) and paste it to the destination article panel.
3. The MT abuse warning does not appear - 'Publish ' button is active.
4. Click on 'Publish' button - "Your translation cannot be published because it contains too much unmodified machine-translated text" warning appear.
If you just type the same text that you pasted, publishing works.