PoorMan: better labelling of button

According to the HIG, button labels should be verbs implying actions.
Replace the "default" button with "create public_html", which is what
will happen if you click it.

Thanks to KapiX for the suggestion.
Fix various typos and inconsistencies in strings

DiskProbe, DriveSetup, Icon-O-Matic, Installer, Login,
PackageInstaller, Screenshot, Translation Inspector, BootManager,
CharacterMap, CodyCam, BPrintJob

DiskUsage: removed useless translation, used only for layouting purposes

Thanks to KapiX for spotting these problems.