Add workflow strings

[Quy]

Summary of Changes

Add missing language strings for the frontend from #39325.

Testing Instructions

Enable Workflow.
Edit an article on the frontend.
Go to the Publishing tab.

Actual result BEFORE applying this Pull Request

Actual result AFTER applying this Pull Request

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[tecpromotion]

I have tested this item ✅ successfully on 27121e3

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[richard67]

I have tested this item ✅ successfully on 27121e3

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39680.}

[richard67]

RTC

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[obuisard]

Thank you @Quy !