Update Torbrowser alpha and add some caveats

This updates TorBrowser to the latest alpha and renames it to that from experimental as that is the name used by the TorProject itself.
It also changes the language to en-US instead of nl and adds some caveats to update with built-in update mechanism thereafter to keep local settings.

Casks/torbrowser-alpha.rb

@@ -0,0 +1,18 @@
+cask :v1 => 'torbrowser-alpha' do
+  version '5.0a3'
+  sha256 '79f5b53f51124d483fd19e33eca1fdbc8fc37a8e2e0d4b55844fd45e8f954ded'
+
+  url "https://dist.torproject.org/torbrowser/#{version}/TorBrowser-#{version}-osx64_en-US.dmg"
+  gpg "#{url}.asc",
+      :key_id => 'ef6e286dda85ea2a4ba7de684e2c6e8793298290'
+  name 'Tor Browser'
+  homepage 'https://www.torproject.org/projects/torbrowser.html'
+  license :oss
+  
+  app 'TorBrowser.app'
+  
+  caveats <<-EOS.undent
+    If you already have a version of TorBrowser installed this will overwrite your local settings.
+    It is recommended to use TorBrowser's built-in update mechanism after the first install to keep your settings.
+  EOS
+end

Casks/torbrowser-experimental.rb

@@ -1,13 +0,0 @@
-cask :v1 => 'torbrowser-experimental' do
-  version '5.0a2'
-  sha256 '4bf5d27b592f4221c5996f1241a428402f1621c2576cb8772438d5f7c3fce320'
-
-  url "https://dist.torproject.org/torbrowser/#{version}/TorBrowser-#{version}-osx64_nl.dmg"
-  gpg "#{url}.asc",
-      :key_id => 'ef6e286dda85ea2a4ba7de684e2c6e8793298290'
-  name 'Tor Browser'
-  homepage 'https://www.torproject.org/projects/torbrowser.html'
-  license :oss
-
-  app 'TorBrowser.app'
-end