A small cleanup stops the spreadsheet edition from trying to translate a blank piece of text. This avoids noisy warnings in automated logs without changing how users interact with spreadsheets.

Trying to extract the translation of an empty string will throw a warning (https://github.com/python-babel/babel/blob/master/babel/messages/extract.py#L356) (Can be observed in `test_only` logs of bundle
`testing post_install from auth_totp to microsoft_outlook`)

This commit removes the translation of the empty string.

This change updates an internal performance test for the appointment app to match the current expected database query count. It helps keep automated checks accurate so teams can detect real performance regressions without false alarms.

task-4141409