i18n: improvements

[lorduskordus]

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displays_reset.webm

Changes

• Makes "revert/keep display settings" dialog show proper sentences (see the video)
  • "..will revert .. in 2 seconds."
  • "..will revert .. in 1 second."
  • "..will revert .. now."
• Adds spaces to a shortcut for consistency, as most of them include spaces
• Adds missing trailing semicolons to keywords
• Adds more display related keywords
  • User is likely to search for "monitor", "screen", "resolution",..
• Fixes a few strings

Note

• I found more minor issues mostly consisting of capitalization, but I'm not sure about the changes, so I decided to not include them in this PR. I might make a separate one just for that later.
• If you want to look into it, most of them are in the Keyboard shortcuts menu
  • Input devices --> Keyboard --> View and customize shortcuts

[mmstick]

I've noticed that merging changes to English keys will delete all unapproved translations of those keys. It may be better to suggest changes in Weblate and revert any pending translations that get discarded on approval.

[lorduskordus]

Unfortunately I can't suggest changes to English ever since it was made read-only.