What is a LANG File Type?
GTK is an open source, cross-platform tool used to create graphical interfaces for programs. It consists of different widgets that are used to design the interface graphics. One of these widgets is GtkTextView, which is used to display and edit multi-line text in the graphical interface. GtkSourceView can extend the functionality of the GtkTextView widget. Some features can be extended by the library, such as loading, saving, searching and replacing files, and highlighting syntax functions.
The syntax highlighting can be added for specific languages; help files LANG in the GtkSourceView library.
Some can be added such as C, C + + +, Java, Fortran, Logtalk, and the Axe Parser, XML, HTML and LaTex programming languages, and the PHP, Python and Perl markup languages.
You will probably only encounter a LANG file if you are a GTK since they are not used by d' other programs. If you want to view or modify a LANG file you can use a plain text editor or XML such as Microsoft Notepad, Apple TextEdit or Microsoft Visual Studio Code.
It was formerly known as the GIMP Toolkit and GTK +.