Use translations from lib and not from core

[DeepDiver1975]

Description

The wrong translation context was used.
And default_language is taken into consideration

Related Issue

• Fixes Files sharing notification email's subject is in english, even though the preferred language is set to german #37040
• fixes Files sharing notification email is in english, even though the preferred language is set to german. #37039

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[phil-davis]

@DeepDiver1975 unit test needs looking at.

[codecov]

Codecov Report

Merging #37056 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37056   +/-   ##
=========================================
  Coverage     64.75%   64.75%           
  Complexity    19138    19138           
=========================================
  Files          1270     1270           
  Lines         74915    74915           
  Branches       1329     1329           
=========================================
  Hits          48513    48513           
  Misses        26011    26011           
  Partials        391      391           

Flag	Coverage Δ	Complexity Δ
#javascript	54.17% <ø> (ø)	0.00 <ø> (ø)	⬆️
#phpunit	65.93% <100.00%> (ø)	19138.00 <10.00> (ø)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
apps/dav/lib/DAV/FileCustomPropertiesBackend.php	89.32% <0.00%> (ø)	33.00% <0.00%> (ø%)	⬆️

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[phil-davis]

Unit test change LGTM