Syntax Highlighting missing for some file extensions.

[Qubik65536]

I found out that some languages are not fully supported. For example, Java source code has two extensions: .jav (which is not that commonly used but is the default for CodeEdit) and .java. And it seems that the .jav files are not supported by the Syntax Highlighting feature.

[lukepistrol]

Should be an easy fix. Will add that now 😉