update for MozillaThunderbird

- update to Thunderbird 31.2.0 (bnc#900941)
* MFSA 2014-74/CVE-2014-1574
Miscellaneous memory safety hazards
* MFSA 2014-75/CVE-2014-1576 (bmo#1041512)
Buffer overflow during CSS manipulation
* MFSA 2014-76/CVE-2014-1577 (bmo#1012609)
Web Audio memory corruption issues with custom waveforms
* MFSA 2014-77/CVE-2014-1578 (bmo#1063327)
Out-of-bounds write with WebM video
* MFSA 2014-79/CVE-2014-1581 (bmo#1068218)
Use-after-free interacting with text directionality
* MFSA 2014-81/CVE-2014-1585/CVE-2014-1586 (bmo#1062876, bmo#1062981)
Inconsistent video sharing within iframe

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