I just fixed lxappearance-obconf plugin.
Now it works nicely with openbox 3.5.
Please test. A new release is needed.

Martin Bagge, if you see this, please coordinate the translation work for this.
A new string is added for Inactive OSD font option.

Then, there should be a new release for this.
I bumped the version number to 0.2.0.

Thank you.