Remove .tx from .gitignore

It contains a configuration that has no reason to be different
for different people. It's not used for storing things like
usernames or passwords.

Author: JosJuice

.gitignore

@@ -30,8 +30,6 @@ CMakeLists.txt.user
 # Ignore emacs temp files
 \#*\#
 .\#*
-# Ignore transifex configuration directory
-.tx
 # Ignore kdevelop files/dirs
 *.kdev4
 # Ignore IDEA/Clion files/dirs