1532 Do not allow words that are digits

[tomaszsmy]

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (816478d) 13.78% compared to head (bb1e164) 13.96%.

Files	Patch %	Lines
...i/elimu/web/content/word/WordCreateController.java	66.66%	1 Missing and 2 partials :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1583      +/-   ##
============================================
+ Coverage     13.78%   13.96%   +0.18%     
- Complexity      454      459       +5     
============================================
  Files           257      257              
  Lines          8503     8512       +9     
  Branches        881      884       +3     
============================================
+ Hits           1172     1189      +17     
+ Misses         7279     7271       -8     
  Partials         52       52              

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