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

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https://hg.mozilla.org/integration/gaia-central/rev/b15f707d712d
Author: Zibi Braniecki <zibi@braniecki.net>
Desc: Merge pull request #34144 from zbraniecki/1254169-migrate-keyboard-to-l20n

Bug 1254169 - Migrate Keyboard to use L20n. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/56fdcba4f8e5
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1254169 - Migrate Keyboard to use L20n

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1571a2ec546f7c773c8fa938b8f6cf2aacb9b4e1", 
+        "git_revision": "7dcf0213800cfb9cc5716c94f0d5e261fb8a0a34", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "48ca9bf43755815a38b930640446c1f3e13aa004", 
+    "revision": "b15f707d712d726dd099ca1f32a043e1150b95aa", 
     "repo_path": "integration/gaia-central"
 }