feat(bot): add i18n support with grammy-i18n package

Add internationalization support to the bot using grammy-i18n package.
Includes English and Russian locale files and updates to session handling.
Disabled db:generate in Dockerfile as it's not needed during build.

apps/bot/locales/en.ftl

@@ -0,0 +1 @@
+start = Hello, how can I help you

apps/bot/locales/ru.ftl

@@ -0,0 +1 @@
+start = Привет, как я могу тебе помочь

apps/bot/package.json

@@ -11,11 +11,12 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
+    "@grammyjs/i18n": "^1.1.2",
     "@hono/node-server": "^1.15.0",
     "@repo/config": "*",
     "@repo/db": "*",
-    "@repo/typescript-config": "*",
     "@repo/logger": "*",
+    "@repo/typescript-config": "*",
     "dotenv": "^17.1.0",
     "grammy": "^1.37.0",
     "hono": "^4.8.4",

apps/bot/src/index.ts

@@ -7,6 +7,7 @@ import { PrismaStorageAdapter } from './session-storage';
 import { BotContext } from './types';
 import { upsertUser } from './middlewares/upsert-user';
 import { onError } from './middlewares/on-error';
+import { I18n } from '@grammyjs/i18n';
 
 const bot = new Bot<BotContext>(config.BOT_TOKEN);
 const storage = new PrismaStorageAdapter();
@@ -15,9 +16,20 @@ bot.use(onError);
 bot.use(session({ storage, initial: () => ({}) }));
 bot.use(upsertUser);
 
+const i18n = new I18n<BotContext>({
+  defaultLocale: 'ru',
+  useSession: true, // whether to store user language in session
+  directory: 'locales', // Load all translation files from locales/.
+  localeNegotiator: async (ctx) => {
+    const session = await ctx.session;
+    return session.__language_code ?? ctx.from?.language_code ?? 'ru';
+  },
+});
+
+bot.use(i18n);
+
 bot.command('start', async (ctx) => {
-  const session = await ctx.session;
-  await ctx.reply('Привет, ' + JSON.stringify(session));
+  await ctx.reply(ctx.t('start'));
 });
 
 if (config.MODE === 'webhook') {

apps/bot/src/session-storage.ts

@@ -1,5 +1,5 @@
-import { prisma } from "@repo/db";
-import { StorageAdapter } from "grammy";
+import { prisma } from '@repo/db';
+import { StorageAdapter } from 'grammy';
 
 export class PrismaStorageAdapter<T extends object>
   implements StorageAdapter<T>
@@ -14,7 +14,6 @@ export class PrismaStorageAdapter<T extends object>
       .then((session) => (session?.data as T) || undefined);
   }
   async write(key: string, data: T): Promise<void> {
-    console.log("write", data);
     await prisma.telegramSession.upsert({
       where: {
         id: key,

apps/bot/src/types.ts

@@ -1,5 +1,6 @@
-import { Context, LazySessionFlavor } from "grammy";
+import { I18nFlavor } from '@grammyjs/i18n';
+import { Context, LazySessionFlavor } from 'grammy';
 
 // config your session data
-export type SessionData = {};
-export type BotContext = Context & LazySessionFlavor<SessionData>;
+export type SessionData = { __language_code?: string };
+export type BotContext = Context & LazySessionFlavor<SessionData> & I18nFlavor;