Fixed EmptyValidator allowing whitespace

If the EditText contains only whitespace then it passes validation due to checking if the field is empty. By using getTrimmedLength you can still check for the emptiness of the field, but also if they have entered only whitespace.
Merge pull request #28 from JamieCruwys/patch-1

Fixed EmptyValidator allowing whitespace
Add traditionnal taiwan translation
Merge pull request #30 from Atheryl/master

Add traditionnal taiwan translation