added test for missing employee checkbox.
removed account_id and voucher_id from cash register (account.bank.statement.line) view, so printed report is shorter.
color palette for appointments state in calendar.
minor fix to docs/comment.
new query for 'View Invoice' button. Will it to work after appointment is cancelled.
initial translation module.
changed error messages to spanish. TODO: find a way to translate.
Merge tag 'v0.5' into develop

Release Version 0.5
Merge branch 'develop' of bitbucket.org:jcventuravs/salon_spa into develop
removed categ_id column from service model. minor udpate to docs.
mayor refactor of tests.
Rebranding to Planning. Refactor of tests to work with clean database.
version bump.
Merge branch 'release/v0.5.1'