In French, the help trigger has a raw content of "afficher l'aider" which is then cooked into "afficher l’aide" (note the different quote character).
Since we were checking the raw content of the trigger against the cooked version of the post, this trigger never worked in French.
This changes so that we cook the trigger before checking in against the cooked version of the post.
DEV: new 'discobot_username' method that is used everywhere instead of 'discobot_user.username' / 'discobot_user.username_lower'
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
