fix: add missing text

[standeren]

Description

Actually, this error message is not sufficient. We should use the same text as when creating a new model:
"schema_editor.invalid_datamodel_upload_filename": "Filnavnet er ugyldig. Du kan bruke tall og store og små bokstaver fra det norske alfabetet, og understrek, punktum og bindestrek.",

But this message is too long to be in a toast.

The best solution for handling this error, invalid name error, is to show an error somewhere near the Last opp button that the user can close, or that closes by itself when triggering another event.

However, the easiest solution with no more code than necessary is using a native alert:

Also added to the error message that the filename must start with a letter which the RegEx limits, but was not reflected in the original error message. See issue

Related Issue(s)

• #{issue number}

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.30%. Comparing base (34a57f0) to head (92e44a9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13629      +/-   ##
==========================================
- Coverage   94.30%   94.30%   -0.01%     
==========================================
  Files        1534     1534              
  Lines       20899    20898       -1     
  Branches     2515     2515              
==========================================
- Hits        19709    19708       -1     
  Misses        945      945              
  Partials      245      245              

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[JamalAlabdullah]

Bra jobba🙂

[ErlingHauan]

Tested OK with valid and invalid names