v1.12.0 Serbian language tweaks, added thai and bg

Hi there!

Minor release containing some new languages and a change to the Serbian translations:

• #109: The sr_Latin language was modified and sr_Latn was fully removed as a duplicate thanks to @ljubar
• #136 Added Thai translations thanks to @Seb33300
• #137 Added Bulgarian translations thanks to @ggabrovski

Happy ago'ing!