Fix #12256 #13263 - add Serbian Latin language and change language lists to show script

[Bartlomiejsz]

Description (*)

This PR adds Serbian Latin language and allows to distinguish which locale is Latin and which is Cyrillic.
Second change is to display script in locale name, so user can select correct language he wants. Before change both sr_Cyrl_RS and sr_Latn_RS would be displayed as Serbian (Serbia). Now those are Serbian (Cyrillic, Serbia) and Serbian (Latin, Serbia).

Fixed Issues (if relevant)

1. Option to select durring instalation Serbian Latin or Serbian Cyrilic #12256: Option to select durring instalation Serbian Latin or Serbian Cyrilic
2. In the magenta (all versions) there is no option to choose Serbian-Latin #13263: In the magenta (all versions) there is no option to choose Serbian-Latin

Manual testing scenarios (*)

1. Go to MBO
2. Go to Stores -> Configuration -> General -> General -> Locale Options -> Locale
3. See both Serbian (Cyrillic, Serbia) and Serbian (Latin, Serbia) locales

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

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[orlangur]

Hi @Bartlomiejsz, I looked into your pull request but noticed it requires some time to comprehend logic :) Will review this week.

[Bartlomiejsz]

@orlangur great, thank you :)

[Bartlomiejsz]

Hi @orlangur, any news regarding this one?

[sidolov]

@magento run all tests

[sidolov]

Hi @Bartlomiejsz , could you please fix static tests and cover introduced changes with automated tests? Thank you!

[Bartlomiejsz]

Hi @sidolov, done, please review :)

[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-5972 has been created to process this Pull Request
✳️ @sidolov, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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