Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5efa211f0198
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23160 from TheoChevalier/bug1056975-fix-browser-tabs

Bug 1056975 -  Backout Browser specific CSS rules for French from 2.0 to...

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https://hg.mozilla.org/integration/gaia-central/rev/774edac542fe
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1056975 -  Backout Browser specific CSS rules for French from 2.0 to fix tabs in Browser

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https://hg.mozilla.org/integration/gaia-central/rev/0c8cd966bbe1
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #22938 from russnicoletti/bug-1047215

Bug 1047215 - [Gallery/Video]Background Overlays are not translated r=johu

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https://hg.mozilla.org/integration/gaia-central/rev/e10d840fa1fb
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 1047215 - [Gallery/Video]Background Overlays are not translated

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0a61e8ad6d617c797b78d2a51e33326418057358", 
+    "revision": "5efa211f0198ab15798b456445f163d57e735cdb", 
     "repo_path": "/integration/gaia-central"
 }