/usr/share/gedit/plugins/modelines/language-mappings is in gedit-common 3.18.3-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [vim]
cs=c-sharp
docbk=docbook
javascript=js
lhaskell=haskell-literate
spec=rpmspec
tex=latex
xhtml=html
[emacs]
c++=cpp
[kate]
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