fix: change begin to language name

[KrissDrawing]

This PR addresses #4257

• [x] Addresses the issue in full
• [ ] Addresses only certain aspects of the issue

Description

Changes begin word to language name. Also removed unused "begin" translations, it seem that they were used only there.

How Can This Be Tested/Reviewed?

go to application 1st step, now it will show languages

Author Checklist:

• [ ] Added QA notes to the issue with applicable URLs
• [ ] Reviewed in a desktop view
• [ ] Reviewed in a mobile view
• [ ] Reviewed considering accessibility
• [ ] Added tests covering the changes
• [ ] Made corresponding changes to the documentation
• [ ] Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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