Updated Czech translations in strings.xml

[Pupon11]

Summary

Updated Czech translations in strings.xml. Adjusted text due to changes in the source file.

PR type

• Reproducible bug fix
• UI glitch/bug fix
• Behavior bug/regression fix
• Small maintenance only, with no UI or behavior change
• Docs accuracy fix
• Translation/localization only
• Approved larger or directional change

Why

To ensure the Czech localization remains accurate and up-to-date with the latest application string changes.

Issue or approval

No linked issue: translation-only update.

UI / behavior impact

• No UI change
• No behavior change
• UI changed only to fix a documented glitch/bug
• Behavior changed only to fix a documented bug/regression
• UI change has explicit maintainer approval
• Behavior change has explicit maintainer approval

Policy check

• I have read and understood CONTRIBUTING.md.
• This PR is small, focused, and limited to one problem.
• This PR is not cosmetic-only.
• Any UI change fixes a linked glitch/bug and includes visual proof, or this PR has no UI change.
• Any behavior change fixes a linked bug/regression or has explicit approval, or this PR has no behavior change.
• This PR does not bundle unrelated refactors, cleanups, formatting, or drive-by changes.
• This PR does not add dependencies, architecture changes, migrations, or product-direction changes without explicit approval.
• I listed the testing performed below.

UI polish, cosmetic-only changes, minor behavior tweaks, and unapproved product changes will be closed without review.

Scope boundaries

Modifies only the strings.xml file for Czech localization. No extra UI polish, behavior tweaks, or code changes are included.

Testing

Translation-only update. Verified XML syntax validity.

Screenshots / Video

Not a UI change.

Breaking changes

None.

Linked issues

No linked issue - translation update only.