Add component class to route node

frontend/src/components/MenuButton.vue

@@ -1,6 +1,7 @@
 <template>
 	<menu-tooltip
 		v-model='menuOpen'
+		class='menu_button'
 		top='0'
 		width='10rem'
 		touch-disabled='true'

frontend/src/components/SelectButton.vue

@@ -1,6 +1,7 @@
 <template>
 	<menu-tooltip
 		v-model='menuOpen'
+		class='select_button'
 		:class='{"select_button--touch": !touchDisabled}'
 	>
 		<template slot='button'>

frontend/src/components/SelectFilter.vue

@@ -1,5 +1,5 @@
 <template>
-	<menu-tooltip v-model='menuOpen'>
+	<menu-tooltip v-model='menuOpen' class='select_filter'>
 		<button
 			slot='button'
 			class='button select_filter__button'