I18n: disambiguate and make a few more strings translatable

Those strings were at least partly disambiguated:
- Area
  - Zone
  - Measurement
- Ease
  - BBone Ease In / Out
- Back
  - Camera BG image depth
  - GP interpolate sequence
- Edge Crease
  - Theme
- Jitter
  - Brush
  - GPencil
  - Lens distorsion compositing node
- Cineon color management
  - Black
  - Gamma
  - White

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D15791

release/scripts/startup/bl_ui/space_info.py

@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 from bpy.types import Header, Menu
 
+from bpy.app.translations import contexts as i18n_contexts
+
 
 class INFO_HT_header(Header):
     bl_space_type = 'INFO'
@@ -61,6 +63,7 @@ class INFO_MT_info(Menu):
 
 class INFO_MT_area(Menu):
     bl_label = "Area"
+    bl_translation_context = i18n_contexts.id_windowmanager
 
     def draw(self, context):
         layout = self.layout