[BUGFIX] Fixed wrong label of tx_yoastseo_prominent_word table, removed exclude fields from table

[RinyVT]

Summary

This PR can be summarized in the following changelog entry:

• Fixed the label of tx_yoastseo_prominent_word, wrong declaration within XLF file
• Removed the exclude=1 of all the fields within the table

Relevant technical choices:

• Since the tx_yoastseo_prominent_word table already has hideTable=true and the table is only used within AJAX requests, no need for exclude fields

Test instructions

This PR can be tested by following these steps:

• Pull branch
• Check within the Access rights of backend user (groups) if the label is showing and if there are no exclude fields

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended

Fixes #561