Improve emoji-picker (#5515)

* Improve emoji-picker

* remove unimplanted translation

* カテゴリのサジェスト

* use unique

migration/1571220798684-CustomEmojiCategory.ts

@@ -0,0 +1,13 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class CustomEmojiCategory1571220798684 implements MigrationInterface {
+
+    public async up(queryRunner: QueryRunner): Promise<any> {
+        await queryRunner.query(`ALTER TABLE "emoji" ADD "category" character varying(128)`, undefined);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<any> {
+        await queryRunner.query(`ALTER TABLE "emoji" DROP COLUMN "category"`, undefined);
+    }
+
+}