Fix issue #2528: Restore language option in crew configuration

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/crew.py

@@ -191,6 +191,14 @@ class Crew(BaseModel):
         default=None,
         description="Path to the prompt json file to be used for the crew.",
     )
+    language: Optional[str] = Field(
+        default="en",
+        description="Language used for the crew, defaults to English.",
+    )
+    language_file: Optional[str] = Field(
+        default=None,
+        description="Path to the language file to be used for the crew.",
+    )
     output_log_file: Optional[Union[bool, str]] = Field(
         default=None,
         description="Path to the log file to be saved",
@@ -609,7 +617,7 @@ class Crew(BaseModel):
                 self._interpolate_inputs(inputs)
             self._set_tasks_callbacks()
 
-            i18n = I18N(prompt_file=self.prompt_file)
+            i18n = I18N(prompt_file=self.prompt_file, language=self.language)
 
             for agent in self.agents:
                 agent.i18n = i18n
@@ -751,7 +759,7 @@ class Crew(BaseModel):
         return self._execute_tasks(self.tasks)
 
     def _create_manager_agent(self):
-        i18n = I18N(prompt_file=self.prompt_file)
+        i18n = I18N(prompt_file=self.prompt_file, language=self.language)
         if self.manager_agent is not None:
             self.manager_agent.allow_delegation = True
             manager = self.manager_agent

src/crewai/utilities/i18n.py

@@ -13,6 +13,10 @@ class I18N(BaseModel):
         default=None,
         description="Path to the prompt_file file to load",
     )
+    language: Optional[str] = Field(
+        default="en",
+        description="Language to use for translations",
+    )
 
     @model_validator(mode="after")
     def load_prompts(self) -> "I18N":
@@ -23,8 +27,12 @@ class I18N(BaseModel):
                     self._prompts = json.load(f)
             else:
                 dir_path = os.path.dirname(os.path.realpath(__file__))
-                prompts_path = os.path.join(dir_path, "../translations/en.json")
-
+                lang = self.language or "en"
+                prompts_path = os.path.join(dir_path, f"../translations/{lang}.json")
+                
+                if not os.path.exists(prompts_path):
+                    prompts_path = os.path.join(dir_path, "../translations/en.json")
+                
                 with open(prompts_path, "r", encoding="utf-8") as f:
                     self._prompts = json.load(f)
         except FileNotFoundError:

tests/crew_language_test.py

@@ -0,0 +1,40 @@
+import pytest
+from unittest.mock import patch
+
+from crewai import Crew, Agent, Process, Task
+from crewai.utilities.i18n import I18N
+
+
+def test_crew_with_language():
+    i18n = I18N(language="en")
+    
+    agent = Agent(
+        role="Test Agent",
+        goal="Test Goal",
+        backstory="Test Backstory",
+        verbose=True
+    )
+    
+    task = Task(
+        description="Test Task",
+        expected_output="Test Output",
+        agent=agent
+    )
+    
+    with patch('crewai.crew.I18N') as mock_i18n:
+        mock_i18n.return_value = i18n
+        
+        crew = Crew(
+            agents=[agent],
+            tasks=[task],
+            process=Process.sequential,
+            verbose=True,
+            language="fr"  # Use French as an example
+        )
+        
+        with patch.object(crew, '_run_sequential_process'):
+            with patch.object(crew, '_set_tasks_callbacks'):
+                with patch('crewai.agent.Agent.create_agent_executor'):
+                    crew.kickoff()
+                    
+                    mock_i18n.assert_called_with(prompt_file=None, language="fr")

tests/utilities/test_i18n.py

@@ -42,3 +42,13 @@ def test_prompt_file():
     i18n.load_prompts()
     assert isinstance(i18n.retrieve("slices", "role_playing"), str)
     assert i18n.retrieve("slices", "role_playing") == "Lorem ipsum dolor sit amet"
+
+
+def test_language_parameter():
+    i18n = I18N(language="en")
+    i18n.load_prompts()
+    assert isinstance(i18n.slice("role_playing"), str)
+
+    i18n = I18N(language="nonexistent")
+    i18n.load_prompts()
+    assert isinstance(i18n.slice("role_playing"), str)