diff --git a/grammars.yml b/grammars.yml
index 1bedce80..ae0245e4 100644
--- a/grammars.yml
+++ b/grammars.yml
@@ -420,3 +420,5 @@ https://github.com/wmertens/sublime-nix:
 - source.nix
 https://raw.githubusercontent.com/eregon/oz-tmbundle/master/Syntaxes/Oz.tmLanguage:
 - source.oz
+https://raw.githubusercontent.com/tenbits/sublime-mask/release/Syntaxes/mask.tmLanguage:
+- source.mask
\ No newline at end of file
diff --git a/lib/linguist/heuristics.rb b/lib/linguist/heuristics.rb
index 48b64d0c..b41469ce 100644
--- a/lib/linguist/heuristics.rb
+++ b/lib/linguist/heuristics.rb
@@ -155,6 +155,22 @@ module Linguist
         Language["LiveScript"]
       end
     end
+    
+    disambiguate "Common Lisp", "NewLisp" do |data|
+      if /^\s*\((defun|defactor|in-package|defpackage) /.match(data)
+        Language["Common Lisp"]
+      elsif /^\s*\(define /.match(data)
+        Language["NewLisp"]
+      end
+    end
+
+    disambiguate "TypeScript", "XML" do |data|
+      if data.include?("<TS ")
+        Language["XML"]
+      else
+        Language["TypeScript"]
+      end
+    end
 
     disambiguate "Frege", "Forth", "text" do |data|
       if /^(: |also |new-device|previous )/.match(data)
@@ -165,13 +181,5 @@ module Linguist
         Language["text"]
       end
     end
-
-    disambiguate "Common Lisp", "NewLisp" do |data|
-      if /^\s*\((defun|defactor|in-package|defpackage) /.match(data)
-        Language["Common Lisp"]
-      elsif /^\s*\(define /.match(data)
-        Language["NewLisp"]
-      end
-    end
   end
 end
diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 398c8e49..72177bbe 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1719,7 +1719,7 @@ Mask:
   ace_mode: mask
   extensions:
   - .mask
-  tm_scope: source.scss
+  tm_scope: source.mask
 
 Mathematica:
   type: programming
@@ -2333,6 +2333,7 @@ Python:
   - BUILD
   - SConscript
   - SConstruct
+  - Snakefile
   - wscript
   interpreters:
   - python
@@ -3079,6 +3080,7 @@ XML:
   - .tmSnippet
   - .tmTheme
   - .tml
+  - .ts
   - .ui
   - .urdf
   - .vbproj
diff --git a/samples/XML/pt_BR.ts b/samples/XML/pt_BR.ts
new file mode 100644
index 00000000..bfaf0015
--- /dev/null
+++ b/samples/XML/pt_BR.ts
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.0" language="pt_BR">
+<context>
+    <name>MainWindow</name>
+    <message>
+        <location filename="../forms/mainwindow.ui" line="22"/>
+        <source>United Kingdom</source>
+        <translation>Reino Unido</translation>
+    </message>
+    <message>
+        <location filename="../forms/mainwindow.ui" line="38"/>
+        <source>God save the Queen</source>
+        <translation>Deus salve a Rainha</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="46"/>
+        <source>England</source>
+        <translation>Inglaterra</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="47"/>
+        <source>Wales</source>
+        <translation>Gales</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="48"/>
+        <source>Scotland</source>
+        <translation>Escócia</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="49"/>
+        <source>Northern Ireland</source>
+        <translation>Irlanda Norte</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="51"/>
+        <source>Portuguese</source>
+        <translation>Português</translation>
+    </message>
+    <message>
+        <location filename="../mainwindow.cpp" line="52"/>
+        <source>English</source>
+        <translation>Inglês</translation>
+    </message>
+</context>
+</TS>
diff --git a/test/test_heuristics.rb b/test/test_heuristics.rb
index 195fb7c8..a384f63f 100644
--- a/test/test_heuristics.rb
+++ b/test/test_heuristics.rb
@@ -150,4 +150,11 @@ class TestHeuristcs < Test::Unit::TestCase
       "LoomScript" => "LoomScript/HelloWorld.ls"
     })
   end
+
+  def test_ts_by_heuristics
+    assert_heuristics({
+      "TypeScript" => all_fixtures("TypeScript", "*.ts"),
+      "XML" => all_fixtures("XML", "*.ts")
+    })
+  end
 end