fix(editor): printable non A-Z chars should output symbols in pinyin

[kanru]

Fixes #592

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 8 lines in your changes missing coverage. Please review.

Project coverage is 88.74%. Comparing base (38cc8ae) to head (bfb814c).

Files	Patch %	Lines
src/editor/mod.rs	50.00%	8 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.8.x     #593      +/-   ##
=================================================
- Coverage          88.77%   88.74%   -0.03%     
=================================================
  Files                 59       59              
  Lines              13651    13677      +26     
=================================================
+ Hits               12119    12138      +19     
- Misses              1532     1539       +7     

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