Localized annotations line

src/client/app/desktop/views/components/post-form.vue

@@ -14,7 +14,7 @@
 			<b>%i18n:@recent-tags%:</b>
 			<a v-for="tag in recentHashtags.slice(0, 5)" @click="addTag(tag)" title="%@click-to-tagging%">#{{ tag }}</a>
 		</div>
-		<input v-show="useCw" v-model="cw" placeholder="内容への注釈 (オプション)">
+		<input v-show="useCw" v-model="cw" placeholder="%i18n:@annotations%">
 		<textarea :class="{ with: (files.length != 0 || poll) }"
 			ref="text" v-model="text" :disabled="posting"
 			@keydown="onKeydown" @paste="onPaste" :placeholder="placeholder"