Fixed broken links in v3.1 info boxes

Also resulted in i18n files being synchronized (due to the addition of new i18n strings).

@LaurentGoderre I had to use a hybrid approach where outside the loop I could use the regular i18n insertion but inside the loop I couldn't get it to work (even with putting ../ and ../../ before it) so had to pull strings from site.json.

@EricDunsworth This should fix a lot (hopefully all) of broken link issues with the info boxes. Please check to see if any were missed.