1) Reworded the "Install missing" explain for the converter
2) "Forked" the final page of a clean install to give two options... #1 being going to the convertor and #2 being the already existing "Take me to your ACP!" stuff.
Shouldn't have broken anything else, though the i18n/L10n lot will need to update their strings for this. ;)
git-svn-id: file:///svn/phpbb/trunk@7078 89ea8834-ac86-4346-8a33-228a782c2dd0