improve readability of toggleText chain

app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_machine_type_dropdown.vue

@@ -63,12 +63,12 @@ export default {
       }
 
       if (!this.hasProject && !this.hasZone) {
-        return s__('ClusterIntegration|Select project and zone to choose machine type.');
+        return s__('ClusterIntegration|Select project.and zone to choose machine type');
       }
 
-      return this.hasZone
-        ? s__('ClusterIntegration|Select machine type')
-        : s__('ClusterIntegration|Select zone to choose machine type');
+      return !this.hasZone
+        ? s__('ClusterIntegration|Select zone to choose machine type')
+        : s__('ClusterIntegration|Select machine type');
     },
     searchPlaceholderText() {
       return s__('ClusterIntegration|Search machine types');

app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_project_id_dropdown.vue

@@ -66,9 +66,9 @@ export default {
         return this.selectedProject.name;
       }
 
-      return this.projects.length
-        ? s__('ClusterIntegration|Select project')
-        : s__('ClusterIntegration|No projects found');
+      return !this.projects.length
+        ? s__('ClusterIntegration|No projects found')
+        : s__('ClusterIntegration|Select project');
     },
     searchPlaceholderText() {
       return s__('ClusterIntegration|Search projects');

app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_zone_dropdown.vue

@@ -60,9 +60,9 @@ export default {
         return this.selectedZone;
       }
 
-      return this.$store.state.selectedProject.projectId.length
-        ? s__('ClusterIntegration|Select zone')
-        : s__('ClusterIntegration|Select project to choose zone');
+      return !this.hasProject
+        ? s__('ClusterIntegration|Select project to choose zone')
+        : s__('ClusterIntegration|Select zone');
     },
     searchPlaceholderText() {
       return s__('ClusterIntegration|Search zones');