Minor grammar fixes

[repligator]

Mostly "are" to "is". See #5715.

[IllianiCBT]

This isn't an appropriate fix, as the value of %s can be either the character's name, or the gender neutral 'they'

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.21%. Comparing base (fd739ba) to head (544acd0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5749      +/-   ##
============================================
- Coverage     10.21%   10.21%   -0.01%     
+ Complexity     6076     6073       -3     
============================================
  Files          1010     1010              
  Lines        139310   139310              
  Branches      20448    20448              
============================================
- Hits          14231    14224       -7     
- Misses       123703   123712       +9     
+ Partials       1376     1374       -2     

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[repligator]

Quick update: English is hard. For some reason words can become plural when the subject is singular and singular when the subject is plural. Sometimes they even become singular when the subject is singular and plural when the subject is plural.

Sue fidgets with their hair.
They fidget with their hair.

This is in addition to is/are.

Sue is smart.
They are smart.

You can sort of dodge the first issue by awkwardly rewording every sentence. For example, the following only needs the first two words in each sentence swapped to switch from given name to they.

Sue is often seen fidgeting with their hair.
They are often seen fidgeting with their hair.

However reading a paragraph where every sentence is written like this (tense? voice?) sounds incredibly unnatural. An ideal solution should be extensible, elegant, require as few resources as possible, and have natural sounding output. I haven't thought of anything that meets those criteria yet.

[IllianiCBT]

Converted this to 'draft' until a solution can be found, as we don't want it being merged by mistake