Add translator documentation and FIXMEs that plural support should be added for some messages.
Add translator documentation and FIXMEs that plural support should be added for some messages.

charlycoste/StatusNet,bankonme/gnu-social,zh/statusnet,xebia/statusnet-oauth2,eXcomm/gnu-social,Piratas/tortuga,xebia/statusnet-oauth2,faulteh/gnu-social,foocorp/gnu-social,faulteh/gnu-social,d3vgru/StatusNet,shashi/StatusNet,charlycoste/StatusNet,gnusocial/mainline,sikevux/bsk-social,zcopley/StatusNet,d3vgru/StatusNet,minmb/statusnet,zcopley/zcopleys-statusnet-clone,zcopley/StatusNet,zcopley/zcopleys-statusnet-clone,minmb/statusnet,furtherfield/gnu-social,furtherfield/gnu-social,eXcomm/gnu-social,bankonme/gnu-social,zh/statusnet,shashi/StatusNet,zh/statusnet,charlycoste/StatusNet,charnimda/lgbtpzn-social,sikevux/bsk-social,chimo/social,gnusocial/mainline,studio666/gnu-social,chimo/social,Piratas/tortuga,znarf/statusnet-ladistribution,UngPirat/freesocial,csarven/statusnet,xebia/statusnet-oauth2,Piratas/tortuga,faulteh/gnu-social,csarven/statusnet,faulteh/gnu-social,znarf/statusnet-ladistribution,Piratas/tortuga,d3vgru/StatusNet,csarven/statusnet,bankonme/gnu-social,UngPirat/freesocial,minmb/statusnet,UngPirat/freesocial,studio666/gnu-social,furtherfield/gnu-social,studio666/gnu-social,csarven/statusnet,studio666/gnu-social,brion/StatusNet,bankonme/gnu-social,zcopley/StatusNet,brion/StatusNet,shashi/StatusNet,foocorp/gnu-social,brion/StatusNet,znarf/statusnet-ladistribution,sikevux/bsk-social,sikevux/bsk-social,zcopley/zcopleys-statusnet-clone,charnimda/lgbtpzn-social,gnusocial/mainline,gnusocial/mainline,foocorp/gnu-social,charnimda/lgbtpzn-social,furtherfield/gnu-social,eXcomm/gnu-social,chimo/social,eXcomm/gnu-social