feat(unit): show propagation failure reason from PermissionResult

Since introduction of PermissionResult the has_perm gives exact reason
why string can't be edited, so display it to the user instead of
checking a single condition only.

weblate/trans/models/unit.py

@@ -20,6 +20,7 @@
 from django.utils.translation import gettext, gettext_lazy
 from pyparsing import ParseException
 
+from weblate.auth.permissions import PermissionResult
 from weblate.checks.flags import Flags
 from weblate.checks.models import CHECKS, Check
 from weblate.formats.helpers import CONTROLCHARS
@@ -1035,26 +1036,19 @@ def get_target_plurals(self, plurals=None):
 
     def propagate(self, user: User, change_action=None, author=None, request=None):
         """Propagate current translation to all others."""
-        from weblate.trans.models import ContributorAgreement
-
         result = False
         for unit in self.same_source_units:
             if unit.target == self.target and unit.state == self.state:
                 continue
-            if user is not None and not user.has_perm("unit.edit", unit):
+            if user is not None and not (denied := user.has_perm("unit.edit", unit)):
                 component = unit.translation.component
-                if (
-                    request
-                    and component.agreement
-                    and not ContributorAgreement.objects.has_agreed(user, component)
-                ):
+                if request and isinstance(denied, PermissionResult):
                     messages.warning(
                         request,
                         gettext(
-                            "String could not be propagated to %(component)s because "
-                            "you have not agreed with a contributor agreement."
+                            "String could not be propagated to %(component)s: %(reason)s"
                         )
-                        % {"component": component},
+                        % {"component": component, "reason": denied.reason},
                     )
                 continue
             unit.target = self.target