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

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https://hg.mozilla.org/integration/gaia-central/rev/0378d51f3e93
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #20251 from awiss/lang-tmpl

Bug 1005760 - [email] on language change, cached card templates not updated. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/0dacc8ea9cfb
Author: Alex Wissmann <awiss@mozilla.com>
Desc: Bug 1005760 - [email] on language change, cached card templates not updated

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https://hg.mozilla.org/integration/gaia-central/rev/b574d573b7e8
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #20254 from awiss/lang-date

Bug 1022941 - [email] On language change, cached timestamps do not change to new language. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/ed67a72f0091
Author: Alex Wissmann <awiss@mozilla.com>
Desc: Bug 1022941 - [email] On language change, cached timestamps do not change to new language
Bumping manifests a=b2g-bump