The Western Chalukya Empire (Kannada:ಪಶ್ಚಿಮ ಚಾಲುಕ್ಯ ಸಾಮ್ರಾಜ್ಯ) ruled most of the western Deccan, South India, between the 10th and 12th centuries. Besides the language of Kannada, what other old language was used during the western Chalukya dynasty?