[FIX] web_editor: translation and no default en_US

Before 036ccbef when writing on qweb field with default language mi_SC:

- writing in mi_SC: wrote on the current res.user language (wrong)
- writing in en_US: wrote on en_US translation (right)
- writing in de_DE: wrote on de_DE translation (right)

but after 036ccbef:

- writing in mi_SC: wrote on mi_SC (right)
- writing in en_US: wrote on mi_SC (wrong)
- writing in de_DE: wrote on mi_SC (wrong)

With this commit, this drawback is also solved by keeping the lang in
context if present.

opw-746776
closes #17917

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