🐛 Add missing frontex emails

fragdenstaat_de/fds_fximport/templates/fds_fximport/emails/failed.txt

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+{% load i18n %}{% autoescape off %}{% blocktrans with name=foirequest.user.get_full_name title=foirequest.title url=action_url %}Hello {{ name }},
+
+there was an error trying to import messages to your request “{{ title }}”. Please try again. If the issue persists, please contact us.
+
+To try again, click the link below:
+
+{{ action_url }}
+
+Cheers,
+{{ site_name }}{% endblocktrans %}
+{% endautoescape %}
+{% include "emails/footer.txt" %}

fragdenstaat_de/fds_fximport/templates/fds_fximport/emails/success.txt

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+{% load i18n %}{% autoescape off %}{% blocktrans with name=foirequest.user.get_full_name title=foirequest.title url=action_url %}Hello {{ name }},
+
+we successfully imported the messages to your request “{{ title }}”. Please read the response and change the status of the request if needed. You can also send another message.
+
+To read your response and to reply to the authority, click the link below:
+
+{{ action_url }}
+
+Cheers,
+{{ site_name }}{% endblocktrans %}
+{% endautoescape %}
+{% include "emails/footer.txt" %}