Replaced CharField by TextField.

see #2081

modoboa/admin/migrations/0018_auto_20201204_0935.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.12 on 2020-12-04 08:35
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('admin', '0017_alarm'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='alarm',
+            name='title',
+            field=models.TextField(),
+        ),
+    ]

modoboa/admin/models/alarm.py

@@ -33,7 +33,7 @@ class Alarm(models.Model):
         db_index=True
     )
 
-    title = models.CharField(max_length=150)
+    title = models.TextField()
     internal_name = models.CharField(max_length=120)
 
     objects = models.Manager.from_queryset(AlarmQuerySet)()