Use only MERGED status

[yolile]

• Let’s only have one MERGED status
• Counter for coordinator filter no working. Make sure the counter for the “Draft Proposals” filter show the sum of
• Add label “Emenda” for all statuses FORKED* and MERGED*
• Add button “See Mother Proposal” in the proposal page for all status that match FORKED* or MERGED*
• If status of proposal contains MERGED, do not allow changing status anymore
• Change “ARQUIVADO” => “ARQUIVADA”
• “este amenda” => “esta amenda”