Possible patch

translation.py.diff

--- a/homeassistant/helpers/translation.py
+++ b/homeassistant/helpers/translation.py
@@ -4,7 +4,7 @@ from os import path
 from typing import Any, Dict, Iterable
 
 from homeassistant import config_entries
-from homeassistant.loader import get_component, bind_hass
+from homeassistant.loader import get_component, get_platform, bind_hass
 from homeassistant.util.json import load_json
 from .typing import HomeAssistantType
 
@@ -34,11 +34,12 @@ def component_translation_file(hass: HomeAssistantType, component: str,
                                language: str) -> str:
     """Return the translation json file location for a component."""
     if '.' in component:
-        name = component.split('.', 1)[1]
+        domain, name = component.split('.', 1)
+        module = get_platform(hass, domain=domain, platform_name=name)
     else:
         name = component
+        module = get_component(hass, component)
 
-    module = get_component(hass, component)
     assert module is not None
     component_path = path.dirname(module.__file__)