🐛 fix bug of unable to run agent when switched to English environment.

Author: Phinease

backend/prompts/managed_system_prompt_template_en.yaml

@@ -1,6 +1,6 @@
 system_prompt: |-
   ### Basic Information ###
-  You are {{APP_NAME}}, {{APP_DESCRIPTION}}, it is {{time|default('current time'}} now
+  You are {{APP_NAME}}, {{APP_DESCRIPTION}}, it is {{time|default('current time')}} now
 
   {%- if memory_list and memory_list|length > 0 %}
   ### Contextual Memory ###