Add context to FwAvaloniaStrings

[papeh]

Copy <summary>s from FAS.cs to <comment>s in FAS.resx for inclusion in Crowdin context. Both screen-reader strings' contexts were missing important details that were present in their summaries. Several other strings had summaries that would be helpful for localizers.

REVIEW: not all of the context is relevant. Much is helpful. Is any confusing?

Co-authored-by: Copilot (Chat GPT)

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This change is 

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Devin

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   10m 54s ⏱️ +32s
6 595 tests ±0  6 510 ✅ ±0  85 💤 ±0  0 ❌ ±0 
6 604 runs  ±0  6 519 ✅ ±0  85 💤 ±0  0 ❌ ±0 

Results for commit 4ad3d1f. ± Comparison against base commit a90754c.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.49%. Comparing base (a90754c) to head (4ad3d1f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1178   +/-   ##
=======================================
  Coverage   39.49%   39.49%           
=======================================
  Files        1537     1537           
  Lines      354392   354392           
  Branches    41058    41058           
=======================================
  Hits       139974   139974           
  Misses     185044   185044           
  Partials    29374    29374           

see 5 files with indirect coverage changes

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