I18n: Disambiguate "Power"

- In the context of color balance, refers to a power function. Uses
  ID_MOVIECLIP context, because the ID_NODE is already used for math
  functions.
- In the context of the scale constraint, also a power function.
- In the context of physics and particle settings, refers to a
  falloff.
- In the context of property subtypes and units, refers to a
  quantity.

Issue reported by Hoang Duy Tran.

scripts/startup/bl_operators/wm.py

@@ -1384,32 +1384,33 @@ rna_custom_property_type_items = (
     ('PYTHON', "Python", "Edit a Python value directly, for unsupported property types"),
 )
 
-rna_custom_property_subtype_none_item = ('NONE', n_("Plain Data"), n_("Data values without special behavior"))
+rna_custom_property_subtype_none_item = ('NONE', n_(
+    "Plain Data", i18n_contexts.unit), n_("Data values without special behavior"))
 
 rna_custom_property_subtype_number_items = (
     rna_custom_property_subtype_none_item,
-    ('PIXEL', n_("Pixel"), n_("A distance on screen")),
-    ('PERCENTAGE', n_("Percentage"), n_("A percentage between 0 and 100")),
-    ('FACTOR', n_("Factor"), n_("A factor between 0.0 and 1.0")),
-    ('ANGLE', n_("Angle"), n_("A rotational value specified in radians")),
-    ('TIME_ABSOLUTE', n_("Time"), n_("Time specified in seconds")),
-    ('DISTANCE', n_("Distance"), n_("A distance between two points")),
-    ('POWER', n_("Power"), ""),
-    ('TEMPERATURE', n_("Temperature"), ""),
+    ('PIXEL', n_("Pixel", i18n_contexts.unit), n_("A distance on screen")),
+    ('PERCENTAGE', n_("Percentage", i18n_contexts.unit), n_("A percentage between 0 and 100")),
+    ('FACTOR', n_("Factor", i18n_contexts.unit), n_("A factor between 0.0 and 1.0")),
+    ('ANGLE', n_("Angle", i18n_contexts.unit), n_("A rotational value specified in radians")),
+    ('TIME_ABSOLUTE', n_("Time", i18n_contexts.unit), n_("Time specified in seconds")),
+    ('DISTANCE', n_("Distance", i18n_contexts.unit), n_("A distance between two points")),
+    ('POWER', n_("Power", i18n_contexts.unit), ""),
+    ('TEMPERATURE', n_("Temperature", i18n_contexts.unit), ""),
 )
 
 rna_custom_property_subtype_vector_items = (
     rna_custom_property_subtype_none_item,
-    ('COLOR', n_("Linear Color"), n_("Color in the linear space")),
-    ('COLOR_GAMMA', n_("Gamma-Corrected Color"), n_("Color in the gamma corrected space")),
-    ('TRANSLATION', n_("Translation"), ""),
-    ('DIRECTION', n_("Direction"), ""),
-    ('VELOCITY', n_("Velocity"), ""),
-    ('ACCELERATION', n_("Acceleration"), ""),
-    ('EULER', n_("Euler Angles"), n_("Euler rotation angles in radians")),
-    ('QUATERNION', n_("Quaternion Rotation"), n_("Quaternion rotation (affects NLA blending)")),
-    ('AXISANGLE', n_("Axis-Angle"), n_("Angle and axis to rotate around")),
-    ('XYZ', n_("XYZ"), ""),
+    ('COLOR', n_("Linear Color", i18n_contexts.unit), n_("Color in the linear space")),
+    ('COLOR_GAMMA', n_("Gamma-Corrected Color", i18n_contexts.unit), n_("Color in the gamma corrected space")),
+    ('TRANSLATION', n_("Translation", i18n_contexts.unit), ""),
+    ('DIRECTION', n_("Direction", i18n_contexts.unit), ""),
+    ('VELOCITY', n_("Velocity", i18n_contexts.unit), ""),
+    ('ACCELERATION', n_("Acceleration", i18n_contexts.unit), ""),
+    ('EULER', n_("Euler Angles", i18n_contexts.unit), n_("Euler rotation angles in radians")),
+    ('QUATERNION', n_("Quaternion Rotation", i18n_contexts.unit), n_("Quaternion rotation (affects NLA blending)")),
+    ('AXISANGLE', n_("Axis-Angle", i18n_contexts.unit), n_("Angle and axis to rotate around")),
+    ('XYZ', n_("XYZ", i18n_contexts.unit), ""),
 )
 
 rna_id_type_items = tuple((item.identifier, item.name, item.description, item.icon, item.value)
@@ -1548,6 +1549,7 @@ class WM_OT_properties_edit(Operator):
     subtype: EnumProperty(
         name="Subtype",
         items=subtype_items_cb,
+        translation_context=i18n_contexts.unit,
     )
 
     # String properties.