Add device class for sensor state translation (#60)

Author: oncleben31

{{cookiecutter.project_name}}/custom_components/{{cookiecutter.domain_name}}/sensor.py

@@ -4,8 +4,6 @@
 
 from homeassistant.util import slugify
 
-from homeassistant.util import slugify
-
 
 async def async_setup_entry(hass, entry, async_add_devices):
     """Setup sensor platform."""
@@ -31,3 +29,8 @@ def state(self):
     def icon(self):
         """Return the icon of the sensor."""
         return ICON
+
+    @property
+    def device_class(self):
+        """Return de device class of the sensor."""
+        return "{{cookiecutter.domain_name}}__custom_device_class"

{{cookiecutter.project_name}}/custom_components/{{cookiecutter.domain_name}}/translations/sensor.en.json

@@ -1,6 +1,6 @@
 {
     "state": {
-        "_": {
+        "{{cookiecutter.domain_name}}__custom_device_class": {
             "some_sample_static_text": "Some sample static text."
         }
     }

{{cookiecutter.project_name}}/custom_components/{{cookiecutter.domain_name}}/translations/sensor.fr.json

@@ -1,6 +1,6 @@
 {
     "state": {
-        "_": {
+        "{{cookiecutter.domain_name}}__custom_device_class": {
             "some_sample_static_text": "Exemple de texte statique."
         }
     }

{{cookiecutter.project_name}}/custom_components/{{cookiecutter.domain_name}}/translations/sensor.nb.json

@@ -1,6 +1,6 @@
 {
     "state": {
-        "_": {
+        "{{cookiecutter.domain_name}}__custom_device_class": {
             "some_sample_static_text": "Eksempel tekst."
         }
     }