[PM-27098] Add additional plurals

[KatherineInCode]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-27098

📔 Objective

This migrates a number of remaining strings that involved plurals into our stringsdict so we can do proper pluralization. In the process, I also deleted some entries that were no longer being used.

This uses some parts of #1999, but not all of it, to provide a more-focused PR for plurals.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 0c84bd93-843d-4358-9ddc-7f0cf057edfa

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.69%. Comparing base (49c082f) to head (3d7dd80).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2199       +/-   ##
===========================================
- Coverage   85.53%   43.69%   -41.85%     
===========================================
  Files        1737      580     -1157     
  Lines      147234    30421   -116813     
===========================================
- Hits       125940    13293   -112647     
+ Misses      21294    17128     -4166     

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