"Ctrl K" and "Ctrl + Shift + D" should be translatable #20739
Description
Steps to reproduce
Non-English languages use words other than "Ctrl" for that key, so shortcuts like "Ctrl K" and "Ctrl + Shift + D" should be translatable.
I was going to submit a PR but I wasn't sure whether we should use concatenation like in BasicMessageComposer line 69, or provide these as separate translatable strings like "Use Ctrl + Enter to send a message".
Outcome
What did you expect?
In German, "Ctrl K" should display as "Strg K"
What happened instead?
The English is used everywhere.
Operating system
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Browser information
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URL for webapp
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Application version
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Homeserver
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Will you send logs?
No