Add support for '.xliff' file extension

Author: seanbudd

identify/extensions.py

@@ -299,6 +299,7 @@
     'xhtml': {'text', 'xml', 'html', 'xhtml'},
     'xacro': {'text', 'xml', 'urdf', 'xacro'},
     'xctestplan': {'text', 'json'},
+    'xliff': {'text', 'xml'},
     'xml': {'text', 'xml'},
     'xq': {'text', 'xquery'},
     'xql': {'text', 'xquery'},
@@ -361,6 +362,7 @@
     '.rstcheck.cfg': EXTENSIONS['ini'],
     '.salt-lint': EXTENSIONS['yaml'] | {'salt-lint'},
     '.sqlfluff': EXTENSIONS['ini'],
+    '.xliff': EXTENSIONS['xliff'],
     '.yamllint': EXTENSIONS['yaml'] | {'yamllint'},
     '.zlogin': EXTENSIONS['zsh'],
     '.zlogout': EXTENSIONS['zsh'],