Text under images can be changed in external_flash_texts.txt
Just put:
Text=Whatever you want to change it to
Example:
Rooms=Navigator
And for the second thing I know how to do it, but tbh removing credits from Joe when you didn't make the swf I don't think should be allowed so I am not going to help you with that. Joe is a old friend of mine and I know he spent a long time learning everything for himself and teaching himself mostly everything he knows about retros, and spent a long time editing habbo swf's to make them customized, and he released them to public for free meaning his credits should remain there; as you didn't spend hours making a habbo.swf and testing it