feat: Add i18n support for Chinese language (#142)

* feat: Add i18n support for Chinese language

* fix: locale not working in Docker environment

components/Sidebar/Search.tsx

@@ -1,5 +1,6 @@
 import { IconX } from "@tabler/icons-react";
 import { FC } from "react";
+import { useTranslation } from "next-i18next";
 
 interface Props {
   searchTerm: string;
@@ -7,6 +8,8 @@ interface Props {
 }
 
 export const Search: FC<Props> = ({ searchTerm, onSearch }) => {
+  const { t } = useTranslation('sidebar');
+
   const handleSearchChange = (e: React.ChangeEvent<HTMLInputElement>) => {
     onSearch(e.target.value);
   };
@@ -20,7 +23,7 @@ export const Search: FC<Props> = ({ searchTerm, onSearch }) => {
       <input
         className="flex-1 w-full pr-10 bg-[#202123] border border-neutral-600 text-sm rounded-md px-4 py-3 text-white"
         type="text"
-        placeholder="Search conversations..."
+        placeholder={t('Search conversations...') || ''}
         value={searchTerm}
         onChange={handleSearchChange}
       />