[ALOY-1067] Support L() in XML as Label text

Description

<Window>
    <Label>L('foo')</Label>  <!-- this print out L('foo') instead of treating it as L() -->
</Window>

Comments

1. Malcolm Hollingsworth 2014-07-02 Question of author only, not suggesting you are doing anything wrong; Rather than;

      <Label>L('foo')</Label>
      

   Why not;

      <Label textid="foo" />
      

2. Tim Poulsen 2014-07-02 [~core13] It's for parallelism as well as to match functionality being worked on for the linked ticket. Expectations are that these work:

      <Label>My label text here</Label>
      <Label text="L('foo')"></Label>
      

   So by extension this should work:

      <Label>L('foo')</Label>
      

3. Malcolm Hollingsworth 2014-07-02 Tim - I know all that, I was asking a specific question of the author - as noted "Question of author only, not suggesting you are doing anything wrong;" I was simply asking for an opinion of the author only - to find out if there was a reason one way over the other as different people have different reasons . If you are not convinced I know this stuff Tim - we need words my old friend.
4. Feon Sua Xin Miao 2014-07-03 [~core13], my opinion was the same as what [~skypanther] has clearly explained above. :)
5. Feon Sua Xin Miao 2014-07-07 PR: https://github.com/appcelerator/alloy/pull/473 Test app: https://github.com/feons/alloy/tree/ALOY-1067/test/apps/testing/ALOY-1067 Functional Test: 1. Run test app on iOS 2. For <Label>L('foo')</Label> locale string is displayed.
6. Tim Poulsen 2014-07-09 PR merged
7. Tim Poulsen 2014-08-22 PRs merged
8. Federico Casali 2014-08-22 Test Case verified and updated. TiSDK 3.4.0.v20140820125714 Appcelerator Studio 3.4.0.201408201526 CLI 3.4.0-dev Alloy 1.5.0-dev Xcode6-beta5 iPhone 5 iOS 7.1.2, Nexus Galaxy 4.3 and Mobileweb Closing.

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