Limit text to 500 chars and wrap it to 70 char per line.

snippets/base/admin.py

@@ -1,5 +1,6 @@
 import json
 import re
+from textwrap import wrap
 
 from django.contrib import admin
 from django.db import transaction
@@ -197,7 +198,8 @@ def text(self, obj):
         text_keys = (obj.template.variable_set
                         .filter(type=models.SnippetTemplateVariable.TEXT)
                         .values_list('name', flat=True))
-        return '\n'.join([data[key] for key in text_keys if data.get(key)])
+
+        return ' '.join(wrap('\n'.join([data[key][:500] for key in text_keys if data.get(key)])))
 
 
 class ClientMatchRuleAdmin(BaseModelAdmin):