email templates: fix missing translation of titles and buttons The buttons and titles of email templates were not correctly translated. The corresponding strings were not part of the i18n files because they were not recognized by the extraction logic. Note: this will generate new translation strings. Reported-by: Jan Heylen <jan.heylen@nokia.com>

pytest >= 4.6.6, < 5.4
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 4.1
Sphinx >= 1.8.0, < 2.4
WebTest >= 2.0.6, < 2.1
isort == 4.3.21
pyflakes == 2.1.1