Localization and missing strings

[nerijunior]

Summary

• Added missing new admin menu_items; (normalized with i18n-tasks`)
• Changed orders/index table to display localized strings for: order_state, payment_state, and shipment_state;
• Localized the new admin page title according to the existing active record strings

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• I agree that my PR will be published under the same license as Solidus.
• I have written a thorough PR description.
• I have kept my commits small and atomic.
• I have localized any and all user-facing strings that I added to the source code.
• I have used clear, explanatory commit messages.

[tvdeyen]

Thanks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.50%. Comparing base (b2b3f2e) to head (e99f2e9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6419   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files         981      981           
  Lines       20479    20479           
=======================================
  Hits        18330    18330           
  Misses       2149     2149           

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