Fundraising tech/Update Thank You Emails

=How to update Thank You email templates=
 * Run on a development machine with the wikimedia/fundraising/crm installed and configured.
 * cd crm/drupal
 * To update templates for all languages
 * drush -v -v make-thank-you
 * To update just a specific language template
 * drush -v -v make-thank-you --languages=fr
 * Use lower-case version
 * Look for any unconsumed tokens: "Bad news, you have errors." This check can be run separately if you wish, using "drush find-unconsumed-tokens".
 * The changes will be written to sites/all/modules/thank_you/templates/html/ under your wikimedia/fundraising/crm repo
 * Inspect the results and run the test GUI to email yourself if desired, at /admin/config/thank_you/test (no /civicrm prefix here, the TY sender is a drupal module).
 * Submit for review, then merge to the deployment branch.

TODO: document how to update to next year's letter, how to update TY mail subject templates.