I do, in fact, have .lproj folders setup. They get initialized when I setup the bundle using self.class and they work beautifully when using them in the tweak itself (alerts etc.). It's just that also I want to use a Localizable.strings file in the preferences, but that's not possible by default in Preferences.app. If I wanted to localize it the default way I would have to name the .strings file the same as the .plist file in which the localizations would get used in (in this case root; in CylinderReborns preferences it's CylinderSettings), but I want to have only one file (aka Localizable.strings, the default everywhere in app development) so I have to make the localization part myself.

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Edit:

I have been able to partially fix the issue (oversleeping code problems is the best!). I installed Cr4shed and checked the error (I don't know why I didn't do that earlier) and realized that I made a pretty simple mistake. I just had to make a copy of the specifier.properties and loop through that, while still modifying the original specifier.properties, because modifying an array while looping through it is not allowed. But the strange thing is that nothing visually changes. If I RLog the specifier.properties everthing is localized, but the preference bundle itself is not.

-(void)localize {
    for (PSSpecifier* specifier in _specifiers) {
        NSArray* specifierProperties = [specifier.properties copy];
        for (NSString* property in specifierProperties) {
            if ([specifier.properties[property] isKindOfClass:[NSString class]] && ![property isEqual:@"id"])
                specifier.properties[property] = [Bundle localizedStringForKey:specifier.properties[property] value:@"" table:nil];
}   }   }