Improve my-tip ui
Removed unnecessary opacity rules
reduce data duplication by removing line numbers from PO files
reorganize the i18n files
remove partial chinese translation
don't omit header, transifex needs it
use transifex-client to upload and download translations
don't keep the dates in the PO files, they'd generate git noise
first run of `make i18n_download`
sync translations as part of the release process
automatically fetch transifex credentials from heroku
use a DB lock to coordinate cron jobs, fixes #2557
add a note about the translation process
Prune unused imports (tangent)
Use simpler form of pg_try_advisory_lock
Merge pull request #2833 from gratipay/coordinated-cron

Coordinate the running of periodic tasks in multiple web processes
Cancel button is in disabled state when no tip is set.
Merge pull request #2831 from gratipay/i18n-transifex

Use transifex for i18n
don't use non-portable `sed` option `-r`
update i18n files