Don't provide Pull item if repository is bare

Signed-off-by: Yue Lin Ho <b8732003@student.nsysu.edu.tw>
Signed-off-by: Sven Strickroth <email@cs-ware.de>
Fix grammar

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Adjust layout of Update Check Dialog

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>