software/theia: enable syntax highlighting for .diff, git commit and git rebase

software/theia/software.cfg

@@ -324,7 +324,10 @@ template =
           "vscode-python": "https://github.com/microsoft/vscode-python/releases/download/2020.1.58038/ms-python-release.vsix",
           "vscode-ruby": "https://github.com/rubyide/vscode-ruby/releases/download/v0.25.0/ruby-0.25.0.vsix",
           "vscode-zc-buildout": "https://github.com/perrinjerome/vscode-zc-buildout/releases/download/v0.2.0/vscode-zc-buildout-0.2.0.vsix",
-          "plantuml": "https://open-vsx.org/api/jebbs/plantuml/2.13.12/file/jebbs.plantuml-2.13.12.vsix"
+          "plantuml": "https://open-vsx.org/api/jebbs/plantuml/2.13.12/file/jebbs.plantuml-2.13.12.vsix",
+          "diff": "https://open-vsx.org/api/rafaelmaiolla/diff/0.0.1/file/rafaelmaiolla.diff-0.0.1.vsix",
+          "git-commit-syntax": "https://github.com/perrinjerome/git-commit-syntax/releases/download/v0.0.1/git-commit-syntax-0.0.1.vsix",
+          "git-rebase-syntax": "https://github.com/perrinjerome/git-rebase-syntax/releases/download/v0.0.1/git-rebase-syntax-0.0.1.vsix"
       }
     }
 rendered = ${buildout:directory}/${:_buildout_section_name_}