Resolve "Frontend for Models"

Closes #1 (closed)

aleksis/apps/lesrooster/frontend/components/lesson_raster/LessonRaster.vue

@@ -78,7 +78,7 @@
               style="left: calc(-20px - 0.5rem)"
               @click="add(left(weekday))"
           >
-            <v-icon>mdi-plus</v-icon>
+            <v-icon>mdi-table-column-plus-before</v-icon>
           </v-btn>
           <v-btn
               v-if="canAddDay(right(weekday))"
@@ -92,7 +92,7 @@
               style="right: calc(-20px - 0.5rem)"
               @click="add(right(weekday))"
           >
-            <v-icon>mdi-plus</v-icon>
+            <v-icon>mdi-table-column-plus-after</v-icon>
           </v-btn>
         </v-card-title>
       </v-card>