Simplify names of generated API client functions

[lkeegan]

• use generated API client for admin login and languages components

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.93050% with 254 lines in your changes missing coverage. Please review.

Project coverage is 14.15%. Comparing base (9316e52) to head (7163e07).

Files with missing lines	Patch %	Lines
frontend/src/lib/client/schemas.gen.ts	0.00%	113 Missing :warning:
frontend/src/lib/client/services.gen.ts	0.00%	102 Missing :warning:
frontend/src/lib/components/Admin/Languages.svelte	0.00%	15 Missing :warning:
frontend/src/lib/components/Admin/Login.svelte	0.00%	11 Missing :warning:
frontend/src/lib/i18n.ts	0.00%	4 Missing :warning:
frontend/src/routes/+layout.ts	0.00%	4 Missing :warning:
mondey_backend/src/mondey_backend/export.py	0.00%	4 Missing :warning:
frontend/src/lib/stores/adminStore.ts	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #99 +/- ## ========================================== - Coverage 14.53% 14.15% -0.38% ========================================== Files 90 90 Lines 4933 5064 +131 Branches 118 118 ========================================== Hits 717 717 - Misses 4153 4284 +131 Partials 63 63 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
51 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud