Bugfix/dropzone in drop folder

[DeepDiver1975]

Description

• fix some translations
• add message for the user that uploading files is not possible in a readonly folder

Related Issue

• Fixes https://github.com/owncloud/enterprise/issues/3842

How Has This Been Tested?

• ✋

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

[codecov]

Codecov Report

Merging #37116 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37116   +/-   ##
=========================================
  Coverage     64.78%   64.78%           
  Complexity    19133    19133           
=========================================
  Files          1270     1270           
  Lines         74914    74914           
  Branches       1328     1328           
=========================================
  Hits          48531    48531           
  Misses        25993    25993           
  Partials        390      390           

Flag	Coverage Δ	Complexity Δ
#javascript	54.18% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.96% <ø> (ø)	19133.00 <ø> (ø)

Impacted Files	Coverage Δ	Complexity Δ
apps/files/templates/list.php	0.00% <ø> (ø)	0.00 <0.00> (ø)
core/js/js.js	55.05% <ø> (ø)	0.00 <0.00> (ø)

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[ChrisEdS]

LRGTM