Maintain array structure
- Test undefined index #
merged branch fabpot/serializer (PR #6302)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #6302).

Commits
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d9b75a3 [Serializer] - Test undefined index #
1a3b985 Maintain array structure
0b9a831 Check if key # is defined in $value

Discussion
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[Serializer] - undefined index #

replaces #6293
Update Portuguese validation messages
Small cleanup in Finder tests.
merged branch andreia/new-validation-msgs (PR #6304)

This PR was merged into the master branch.

Commits
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655fd6e Update Portuguese validation messages

Discussion
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Update Portuguese validation messages
merged branch hizai/master (PR #6303)

This PR was merged into the master branch.

Commits
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af3e314 Updated basque translations

Discussion
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Updated basque translations
merged branch umpirsky/clean-finder-test (PR #6305)

This PR was merged into the master branch.

Commits
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57e70a7 Small cleanup in Finder tests.

Discussion
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[Finder] Small cleanup in tests.
merged branch umpirsky/issue-5797 (PR #6301)

This PR was merged into the master branch.

Commits
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a1fb945 CS fixes.
ac58681 Fix loaders to check if resource exists.

Discussion
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[Translation] Fix loaders to check if resource exists.

This was mentioned in #5797.

The problem is that some translation loaders throw exception when translation resource is not found, some produce warnings and some ignore this and return empty catalog.

After this fix, all of them will throw exception in such case. But still, some of them will throw `RuntimeException` and some `InvalidArgumentException` which is not perfect, but still one step in right direction.
Updated Romanian translations
merged branch dlsniper/ro-translations (PR #6307)

This PR was merged into the master branch.

Commits
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58f9d00 Updated Romanian translations

Discussion
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Updated Romanian translations

Added Romanian translation for card validation
[Validator] Update Russian validation messages
merged branch rybakit/validator_messages (PR #6309)

This PR was merged into the master branch.

Commits
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3d736ee [Validator] Update Russian validation messages

Discussion
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[Validator] Update Russian validation messages
first translation to Welsh
added slovenian translations
merged branch meigwilym/master (PR #6310)

This PR was merged into the master branch.

Commits
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6c6bf53 first translation to Welsh

Discussion
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[Validator][Resources] added new Welsh translation file

Added a Welsh (cy) version of src/Symfony/Component/Validator/Resources/translations/validators.en.xlf
merged branch alsar/slovenian-translation (PR #6311)

This PR was merged into the master branch.

Commits
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29595d1 added slovenian translations

Discussion
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[Validator] Added Slovenian translations for card validation
Update basque translation

Update translations in lines 195 and 203
merged branch hizai/patch-2 (PR #6314)

This PR was merged into the master branch.

Commits
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fc62906 Update basque translation

Discussion
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Update basque translation

Update translations in lines 195 and 203
Updated czech translations