Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/debdbd06e397
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #15033 from EragonJ/bug-956642

Bug 956642 - [Settings] add marionette for language change

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https://hg.mozilla.org/integration/gaia-central/rev/a12ea9eeb693
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 956642 - [Settings] add marionette for language change

- add marionette test for language

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "01189577cdacd3e44dbbd94b6cf189bc2f84fbd9", 
+    "revision": "debdbd06e397dc42a70b1764fcfd57ac07429f75", 
     "repo_path": "/integration/gaia-central"
 }