Missing czech i18n translations

[Kasinhou]

Description

Translated missing czech messages.

Checklist

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[tdonohue]

👍 Thanks @Kasinhou for the updated translations. These all look good to me

[tdonohue]

@Kasinhou : One note however. I Just realized this PR is built against the dspace-10.0-testathon branch. We need all PRs to be against main (and we'll copy them over to the testathon branch as needed).

I just switched this PR to be against the main branch, but now it has code conflicts. Could you resolve those conflicts or resubmit the PR against the main branch?

[Kasinhou]

@Kasinhou : One note however. I Just realized this PR is built against the dspace-10.0-testathon branch. We need all PRs to be against main (and we'll copy them over to the testathon branch as needed).

I just switched this PR to be against the main branch, but now it has code conflicts. Could you resolve those conflicts or resubmit the PR against the main branch?

@tdonohue thank you for the clarification. I have resolved the conflicts and also translated additional i18n keys in this update.
Please hold off on merging this PR for now - I would like our Czech community to review those translations first before it goes in.