luci-app-upnp: restore some i18n keys

[stokito]

Leftovers from #7407
CC @Self-Hosting-Group

[systemcrash]

These changes look fine

[stokito]

@Self-Hosting-Group there are two other unrestored keys but what is more important that you removed the cleanup_interval that should be restored.

[Self-Hosting-Group]

@Self-Hosting-Group there are two other unrestored keys but what is more important that you removed the cleanup_interval that should be restored.

Please! Check the PR description/comments and the issue/PR upstreams. Analysis and doesn't work on OpenWrt for years, and you come very late with it.

[stokito]

If it doesn't work that may be a bug, I see something similar here #5774
I'm not sure if the options are actually needed at all even if they work but it may be used by someone. The main focus of your PR was on changing text but removing of the options was briefly mentioned so maybe wasn't noticed during a review.

[systemcrash]

There were previous attempts where there was... a lot of discussion. I'm fairly sure we went through those options that were removed.

[systemcrash]

Merged, thanks @stokito !