fix: Modify the desc of app on locales file.

Created by: fuchunlan

Signed-off-by: lannyfu lannyfu@yunify.com

What type of PR is this? /kind bug

What this PR does / why we need it: To add a hint of the maximum length limit for the input field in the Edit Application Template page.

Which issue(s) this PR fixes:

Fixes ##kubesphere/kubesphere/3536

Special notes for reviewers:

Additional documentation, usage docs, etc.: