Pontoon: Update Slovenian (sl) localization of Firefox
Co-authored-by: Lan Glad <upwinxp@gmail.com>
Co-authored-by: Matjaž Horvat <matjaz.horvat@gmail.com>
c22eb9f2bb0f37dc3cd1015e541ed9e34a06eb19 GECKO_1_9_2_BASE
3c7c10222daf954d950506bd4783045fedd750d6 FENNEC_31_0b10_RELEASE
3c7c10222daf954d950506bd4783045fedd750d6 FENNEC_31_0b10_BUILD2