You can include a placeholder to add for example user name, and in translations where word order changes
output = _('Today is %(month)s %(day)s.') % {'month': m, 'day': d}
{% blocktrans %}Are you sure you want to delete this {{activity_singular_lower}}?{% endblocktrans %}
#, python-format
msgid "Are you sure you want to delete this %(activity_singular_lower)s?"
msgstr ""
#, python-format
msgid "Are you sure you want to delete this %(activity_singular_lower)s?"
msgstr "ဤ%(activity_singular_lower)sကို ဖျက်လိုတာသေချာပါသလား?"