Starting i18n language file support

src/crewai/utilities/i18n.py

@@ -7,7 +7,7 @@ from pydantic import BaseModel, Field, PrivateAttr, ValidationError, model_valid
 
 class I18N(BaseModel):
     _translations: Dict[str, Dict[str, str]] = PrivateAttr()
-    language_file: str = Field(
+    language_file: Optional[str] = Field(
         default=None,
         description="Path to the translation file to load",
     )

tests/utilities/test_i18n.py

@@ -0,0 +1,40 @@
+import pytest
+
+from crewai.utilities.i18n import I18N
+
+
+def test_load_translation():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    assert i18n._translations is not None
+
+
+def test_slice():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    assert isinstance(i18n.slice("role_playing"), str)
+
+
+def test_errors():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    assert isinstance(i18n.errors("unexpected_format"), str)
+
+
+def test_tools():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    assert isinstance(i18n.tools("ask_question"), str)
+
+
+def test_retrieve():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    assert isinstance(i18n.retrieve("slices", "role_playing"), str)
+
+
+def test_retrieve_not_found():
+    i18n = I18N(language="en")
+    i18n.load_translation()
+    with pytest.raises(Exception):
+        i18n.retrieve("nonexistent_kind", "nonexistent_key")