implement the dump_accounts command

counter/templates/counter/mails/account_dump.jinja

@@ -0,0 +1,22 @@
+{% trans %}Hello{% endtrans %},
+
+{% trans trimmed amount=user.customer.amount, date=user.warning_date|date(DATETIME_FORMAT) -%}
+  Following the email we sent you on {{ date }},
+  the money of your AE account ({{ amount }} €) has been recovered by the AE.
+{%- endtrans %}
+
+{% trans trimmed -%}
+  If you think this was a mistake, please mail us at ae@utbm.fr.
+{%- endtrans %}
+
+{% trans trimmed -%}
+  Please mind that this is not a closure of your account.
+  You can still access it via the AE website.
+  You are also still able to renew your subscription.
+{%- endtrans %}
+
+{% trans %}Sincerely{% endtrans %},
+
+L'association des étudiants de l'UTBM
+6, Boulevard Anatole France
+90000 Belfort

counter/templates/counter/mails/account_dump_warning.jinja

@@ -0,0 +1,40 @@
+{% trans %}Hello{% endtrans %},
+
+{% trans trimmed date=last_subscription_date|date(DATETIME_FORMAT) -%}
+  You received this email because your last subscription to the
+  Students' association ended on {{ date }}.
+{%- endtrans %}
+
+{% trans trimmed date=dump_date|date(DATETIME_FORMAT), amount=balance -%}
+  In accordance with the Internal Regulations, the balance of any
+  inactive AE account for more than 2 years automatically goes back
+  to the AE.
+  The money present on your account will therefore be recovered in full
+  on {{ date }}, for a total of {{ amount }} €.
+{%- endtrans %}
+
+{% trans trimmed -%}
+  However, if your subscription is renewed by this date,
+  your right to keep the money in your AE account will be renewed.
+{%- endtrans %}
+
+{% if balance >= 10 -%}
+  {% trans trimmed -%}
+    You can also request a refund by sending an email to ae@utbm.fr
+    before the aforementioned date.
+  {%- endtrans %}
+{%- endif %}
+
+{% trans trimmed -%}
+  Whatever you decide, you won't be expelled from the association,
+  and you won't lose your rights.
+  You will always be able to renew your subscription later.
+  If you don't renew your subscription, there will be no consequences
+  other than the loss of the money currently in your AE account.
+{%- endtrans %}
+
+{% trans %}Sincerely{% endtrans %},
+
+L'association des étudiants de l'UTBM
+6, Boulevard Anatole France
+90000 Belfort