browse: let parenthesis to be translatable

Move the parenthesis into the gettext string and let the translator
determine the correct one.
For example, double-width parenthesis "（）" instead of ones in ASCII are
used in zh_TW locale.

Signed-off-by: Ｖ字龍(Vdragon) <pika1021@gmail.com>
Merge pull request #271 from Vdragon/improve_source_language

browse: make parenthesis to translatable

Signed-off-by: David Aguilar <davvid@gmail.com>