Move old changelog entries to Changelog_old.txt.
Add a Fulah translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/ff/.
Add an Indonesian translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/id/.
Add a Bulgarian translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/organization/mpc-hc/team/3979/members/bg/.