Add localization to Edit Slot Options text.
Correct typo and add a few Portuguese translations for 'unofficial' strings.
Add localize calls to a bunch of strings.
Update last_changed value.
Make menu item text similar to other picture generating itens.
Add a few new strings to Portuguese translations.
Merge pull request #241 from MMSequeira/master

Added localize() calls to a bunch of missing strings and added also a bunch of Portuguese translations to 'unofficially' localized strings.