Changelog cleanup.

patchset2: Forgot the translator cleanup.
patchset3: add Kim Lê to German translators
patchset4: add Bart Tiemersma to Dutch translators (only JB)
patchset5: Moved Maintainers & Translators to CONTRIBUTORS.mkdn
           Added d2usc, evita, jewel & ville.
	   Added Jorge Ruesga as Spanish translator

patchset7: Added Andrew Jiang and John Hsing as Simplified Chinese Translators.

Change-Id: Id4779d33c9e8455260847f44eb6d393fbe439430