core: fix translation fallback

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.35.7",
+    "version": "2.35.8",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/service/server.ts

@@ -312,7 +312,7 @@ export class HandlerCommon {
 
     translate(str: string) {
         if (!str) return '';
-        return str.toString().translate(this.user?.viewLang, this.session?.viewLang, system.get('server.language'));
+        return str.toString().translate(this.user?.viewLang || system.get('server.language'), this.session?.viewLang);
     }
 
     renderTitle(str: string) {