Fix broken tables whose msgstr is a specific type of HTML

[shinmili]

If an msgstr for a table cell contains HTML that could be parsed as an HTML block if it were put in the top-level, the table is rendered incorrectly. The table row containing the cell gets interrupted in the middle and split into two (or more, if there are more such cells) incomplete rows.

Close #251.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.23810% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.37%. Comparing base (886f15e) to head (f9ae9a6).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
i18n-helpers/src/lib.rs	91.89%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   84.74%   85.37%   +0.62%     
==========================================
  Files          15       16       +1     
  Lines        3377     3527     +150     
  Branches     3377     3527     +150     
==========================================
+ Hits         2862     3011     +149     
+ Misses        413      412       -1     
- Partials      102      104       +2     

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