Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5cd4c50b1a4b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1138350 - [Messages][RTL] Ellipsis direction fix in thread list view, r=azasypkin/julienw"

This reverts commit 3f9cda2a52a6a501fdf51dea447b8a0293443c51.

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https://hg.mozilla.org/integration/gaia-central/rev/7d6efbc26149
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1140321 - merge pull request #28798 from gmarty:Bug-1140321-RTL-Downloads-list to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/568141e6553e
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1140321 - [RTL][Download] Fail to download the file, then the error icon is left-aligned and overlap with refresh icon in download list

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https://hg.mozilla.org/integration/gaia-central/rev/252feed1c72d
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1144435 - merge pull request #28936 from ath0mas:fix-l10n-default-locale to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/514861f49a68
Author: Alexis THOMAS <fr.alexisthomas@gmail.com>
Desc: Bug 1144435 - Fix l10n meta reading to get defaultLocale

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "72e6b3c2683e868266aec3a030d75f0ec403f11b", 
+        "git_revision": "d3d20d982308484951038c74cfd5eea6bb6a0d5a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "dbda46b14dfd8f0e221ab86f83b5fb2dcb639cf1", 
+    "revision": "5cd4c50b1a4bc9dc90a559cb021620ff2929276e", 
     "repo_path": "integration/gaia-central"
 }