Change .pot files to only contain at most 5 context lines

Crowdin did not like having many comments which caused the upload to
fail.

docs/_templates/gettext/message.pot_t

@@ -0,0 +1,33 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) {{ copyright }}
+# This file is distributed under the same license as the {{ project }} package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: {{ project|e }} {{ version|e }}\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: {{ ctime|e }}\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: {{ last_translator|e }}\n"
+"Language-Team: {{ language_team|e }}\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+{% for message in messages %}
+{% if display_location -%}
+{% for source, line in message.locations[:5] -%}
+#: {{ relpath(source) }}:{{ line }}
+{% endfor -%}
+{% endif -%}
+
+{% if display_uuid -%}
+{% for uuid in message.uuids -%}
+#: {{ uuid }}
+{% endfor -%}
+{% endif -%}
+
+msgid "{{ message.text|e }}"
+msgstr ""
+{% endfor -%}