Lengthen "key actors" and "who..involved" fields

apps/map/models.py

@@ -813,12 +813,9 @@ class CaseStudy(models.Model):
     )
 
     # 3.1.3 + 3.2.5
-    key_actors_involved = models.CharField(
+    key_actors_involved = models.TextField(
         verbose_name=_('Key actors involved (individual/organisational)'),
-        max_length=256,
-        default=None,
-        null=True,
-        blank=True
+        blank=True, null=True
     )
 
     # 3.1.4
@@ -944,12 +941,9 @@ class CaseStudy(models.Model):
     )
 
     # 3.2.4.2
-    who_has_been_involved = models.CharField(
+    who_has_been_involved = models.TextField(
         verbose_name=_("Which communities, groups and organisations have been involved?"),
-        max_length=512,
-        default=None,
-        null=True,
-        blank=True
+        blank=True, null=True
     )
 
     # 3.2.4.3