Add missing translations for new project page elements

[Withalion]

Fixes untranslated texts in field type dropdowns in new project creation page. Issue has been mentioned in #4273
. Besides that did some refactor in nearby code.

PS: Currently my VCPKG setup is broken, so I don't guarantee it's 100% working

[github-actions]

Coverage Report for CI Build 25385504975

Coverage decreased (-0.09%) to 57.833%

Details

• Coverage decreased (-0.09%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 227 coverage regressions across 9 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

227 previously-covered lines in 9 files lost coverage.

File	Lines Losing Coverage	Coverage
mm/app/main.cpp	97	36.11%
mm/app/projectwizard.cpp	62	2.16%
mm/app/fieldsmodel.cpp	36	0.0%
mm/core/merginapi.cpp	13	75.07%
mm/core/merginuserauth.cpp	9	68.24%
mm/app/inputexpressionfunctions.cpp	7	0.0%
mm/app/fieldsmodel.h	1	50.0%
mm/app/position/providers/simulatedpositionprovider.cpp	1	91.67%
mm/app/projectwizard.h	1	50.0%

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Coverage Stats

Relevant Lines:	15230
Covered Lines:	8808
Line Coverage:	57.83%
Coverage Strength:	100.15 hits per line

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💛 - Coveralls

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	❌	Build failed or not found.		#6812
linux Build	📬	Mergin Maps 68231 x86_64	Expires: 03/08/2026	#6823
win64 Build	📬	Mergin Maps 60071 win64	Expires: 03/08/2026	#6007
Android Build	📬	Mergin Maps 812411 APK [armeabi-v7a]	Expires: 03/08/2026	#8124
	📬	Mergin Maps 812411 APK [armeabi-v7a]	Google Play Store	#8124
Android Build	📬	Mergin Maps 812451 APK [arm64-v8a]	Expires: 03/08/2026	#8124
	📬	Mergin Maps 812451 APK [arm64-v8a]	Google Play Store	#8124
iOS Build	❌	Build failed or not found.		#9063