Resolve "[Lesson substitution] View with all lesson substitutions in the future"

Closes #11 (closed)

biscuit/apps/chronos/tables.py

@@ -37,9 +37,10 @@ class SubstitutionsTable(tables.Table):
     class Meta:
         attrs = {'class': 'table table-striped table-bordered table-hover table-responsive-xl'}
 
+    week = tables.Column(accessor='week')
     lesson_period = tables.Column(accessor='lesson_period')
     lesson__groups = tables.Column(accessor='lesson_period.lesson.group_names', verbose_name=_('Groups'))
     lesson__teachers = tables.Column(accessor='lesson_period.get_teacher_names', verbose_name=_('Teachers'))
-    lesson__subject = tables.Column(accessor='lesson.')
+    lesson__subject = tables.Column(accessor='lesson.subject')
     room = tables.Column(accessor='lesson_period.room')
-    cancelled = tables.Column(accessor='cancelled')
+    cancelled = tables.Column(accessor='cancelled', verbose_name=_('Cancelled'))