chore: add translation content json files to .pretterignore (#1083)

Whenever I make a change to the translation `json` files in
`/public/locales/en/*.json` it changes the format for the whole file,
which is annoying and a little risky. Merge conflicts are more common
and we should be able to track the specific changes within these files
when doing code review.

My solution is just to have Prettier ignore these translation files.
Alternatively, to solve this problem we could update all automation
scripts to match our prettier settings... but this is simpler.

Let me know if your thoughts on this change, any objections?

.prettierignore

@@ -5,6 +5,9 @@ coverage
 # Ignore all HTML files:
 **/*.html
 
+# Ignore all JSON files in locales:
+**/locales/**/*.json
+
 # Logs
 logs
 *.log