[Tests-Only] Add acceptance test for translated response messages

[jasson99]

Description

This PR adds acceptance test for the translated error messages when the Accept-Language header is set to some preferred language.

Related Issue

owncloud/QA#608

How Has This Been Tested?

CI

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

[dpakach]

LGTM 👍

some reviews to fix

[codecov]

Codecov Report

Merging #37069 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37069   +/-   ##
=========================================
  Coverage     64.75%   64.76%           
- Complexity    19135    19136    +1     
=========================================
  Files          1270     1270           
  Lines         74909    74915    +6     
  Branches       1329     1328    -1     
=========================================
+ Hits          48511    48517    +6     
- Misses        26007    26008    +1     
+ Partials        391      390    -1     

Flag	Coverage Δ	Complexity Δ
#javascript	54.18% <ø> (+0.01%)	0.00 <ø> (ø)
#phpunit	65.93% <ø> (+<0.01%)	19136.00 <ø> (+1.00)

Impacted Files	Coverage Δ	Complexity Δ
apps/files_external/lib/Lib/Storage/Google.php	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
core/js/shareitemmodel.js	80.51% <0.00%> (+0.41%)	0.00% <0.00%> (ø%)
apps/files/lib/Command/TransferOwnership.php	81.57% <0.00%> (+0.75%)	43.00% <0.00%> (+1.00%)

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[phil-davis]

@dpakach please review again. This looks OK - I guess the risk is the a translator of one of these languages decides to change the translation, and then CI will suddenly break. But it will be easy to fix if it happens.

Then the commits can be squashed before merging.

[dpakach]

Use outline to test for different languages rather than repeating it every time.

[dpakach]

LGTM 👍

[phil-davis]

For this sort of scenario it is OK to have repeated When/Then - otherwise it takes so much time if we have 8 rows in the examples table...

[phil-davis]

drone had timeouts pulling some docker images. I restarted it.