Continued migrating UI to vuetify 2

app/imports/ui/dialogStack/DeleteConfirmationDialog.vue

@@ -24,7 +24,7 @@
     <v-spacer slot="actions" />
     <v-btn
       slot="actions"
-      flat
+      text
       @click="$store.dispatch('popDialogStack')"
     >
       Cancel

app/imports/ui/dialogStack/DialogBase.vue

@@ -16,7 +16,6 @@
       >
         <v-btn
           icon
-          flat
           @click="back"
         >
           <v-icon>arrow_back</v-icon>
@@ -67,7 +66,7 @@
         return isDarkColor(this.computedColor);
       },
       computedColor(){
-        return this.color || this.$vuetify.theme.secondary;
+        return this.color || this.$vuetify.theme.themes.light.secondary;
       }
     },
 		methods: {

app/imports/ui/dialogStack/DialogStack.vue

@@ -213,7 +213,7 @@
     right: 0;
     bottom: 0;
     background-color: rgba(0, 0, 0, 0.4);
-    z-index: 4;
+    z-index: 6;
     pointer-events: initial;
   }
   .backdrop-fade-enter-active, .backdrop-fade-leave-active {
@@ -229,7 +229,7 @@
     right: 0;
     bottom: 0;
     pointer-events: none;
-    z-index: 4;
+    z-index: 6;
   }
   .dialog-sizer {
     position: relative;
@@ -239,7 +239,7 @@
     height: 80%;
     height: calc(100% - 64px);
     max-height: 800px;
-    z-index: 5;
+    z-index: 7;
     flex: initial;
   }
   /* sm */