#36 Quality checks

* adds AbstractQualityChecker as base for all quality checker instances
* adds InterventionQualityChecker, inheriting from AbstractQualityChecker
* adds functionality to InterventionQualityChecker
* adds/updates translations

konova/utils/quality.py

@@ -0,0 +1,34 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 25.10.21
+
+"""
+from abc import abstractmethod
+from django.utils.translation import  gettext_lazy as _
+
+from konova.models import BaseObject
+
+
+class AbstractQualityChecker:
+    valid = False
+    messages = []
+    obj = None
+
+    class Meta:
+        abstract = True
+
+    def __init__(self, obj: BaseObject):
+        self.obj = obj
+        self.messages = []
+        self.valid = False
+
+    @abstractmethod
+    def run_check(self):
+        raise NotImplementedError
+
+    def _add_missing_attr_name(self, attr_name: str):
+        missing = _('missing')
+        self.messages.append(f"{attr_name} {missing}")
+