stringtables: support single quotes

[BrettMayson]

Fixes #1228

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.3%. Comparing base (dd3e10c) to head (ef5c774).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/stringtable/src/project.rs	93.7% <100.0%> (+<0.1%)	⬆️

... and 1 file with indirect coverage changes

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