It would be nice if config.inc.php could override certain built-in UI vocabulary terms, say, to match house terminology.
For example, in our organization, we have deployed two instances of MRBS (with different access rights): one called "Meeting Room Booking System", and another called "Office Booking System".
With this feature, I could specify
$vocab_override['en']['mrbs'] = 'Office Booking System';
on the latter system and not have to hack lang.en every time I upgrade.
The suggested patch is the minimal change to implement this feature. It's ugly copy-and-paste programming; I suggest cleaning it up before incorporating it into MRBS.