fix: button aria label and roles

Signed-off-by: greta <gretadoci@gmail.com>

src/components/NewMessageButtonHeader.vue

@@ -7,7 +7,6 @@
 		<ButtonVue :aria-label="t('mail', 'New message')"
 			type="secondary"
 			button-id="mail_new_message"
-			role="complementary"
 			:wide="true"
 			@click="onNewMessage">
 			<template #icon>

src/components/SearchMessages.vue

@@ -12,7 +12,10 @@
 				:aria-label="t('mail', 'Search in folder')"
 				@focus="showButtons = true"
 				@blur="hideButtonsWithDelay">
-			<NcButton type="tertiary" class="search-messages--filter" @click="moreSearchActions = true">
+			<NcButton type="tertiary"
+				:aria-label="t('mail', 'Open search modal')"
+				class="search-messages--filter"
+				@click="moreSearchActions = true">
 				<template #icon>
 					<FilterVariantIcon :size="20" />
 				</template>