Fix a bug about dialog's file filter,chinese edition only.

Hi,I fix a bug about dialog's file filter(chinese edition only).
I used pgmodeler in Windows/Ubuntu(chinese edition).But I opened or saved a model using the open/save dialog,it can't display the *.dbm files or all files(*.*).
The reason is that, the translation in file lang/zh_CN.ts is incorrent.
数据库模型（*.dbm）;; 所有文件（*.*）
"（" and "）" were chinese character.So I fixed them.