[ca] add some url in grammar rules
[ca] Fixed false alarm: la número u
[ca] New rule UN_U
[ca] Improved rule NET
[ca] Improved rules: regional variants of verbs
[ca] New rule BO_BON
[ca] New rule EN_UN_OBRIR_I_TANCAR_DULLS
[ca] Extend rule QUE_QUE
[ca] update catalan.info