added 'dir'=>'ltr' to some fields
Some fields in the installer should always be dir="ltr" by default, because they are most likely Latin:
In a rare case that some of these fields would be written in an RTL alphabet (an Arabic directory name, for instance), the user will be able to change the direction using Ctrl-Shift(-X).
Patch attached. It's my first PHP patch, so please be gentle :)