Fix #105548: I18n: many keymap sections cannot be translated

Ensure tool keymaps are registered when calling:
bl_keymap_utils.keymap_hierarchy.generate() in background mode.

This is an alternative to !116299 that doesn't require keymap
initialization in background mode.
Thanks to Damien Picard's for reporting & investigating this issue.

scripts/modules/bl_keymap_utils/keymap_hierarchy.py

@@ -26,6 +26,13 @@ def _km_hierarchy_iter_recursive(items):
 
 
 def generate():
+    import bpy
+
+    if bpy.app.background:
+        from bl_ui.space_toolsystem_common import ToolSelectPanelHelper
+        for cls in ToolSelectPanelHelper.__subclasses__():
+            cls.register_ensure()
+
     return list(_km_hierarchy_iter_recursive(_km_hierarchy))
 
 

scripts/startup/bl_ui/space_toolsystem_common.py

@@ -499,6 +499,15 @@ class ToolSelectPanelHelper:
         if kc_default is not kc:
             kc_default.keymaps.new(km_idname, **km_kwargs)
 
+    @classmethod
+    def register_ensure(cls):
+        """
+        Ensure register has created key-map data, needed when key-map data is needed in background mode.
+        """
+        if cls._has_keymap_data:
+            return
+        cls.register()
+
     @classmethod
     def register(cls):
         wm = bpy.context.window_manager
@@ -513,6 +522,7 @@ class ToolSelectPanelHelper:
 
         # ignore in background mode
         if kc_default is None:
+            cls._has_keymap_data = False
             return
 
         for context_mode, tools in cls.tools_all():
@@ -530,6 +540,8 @@ class ToolSelectPanelHelper:
                 if callable(keymap_data[0]):
                     cls._km_action_simple(kc_default, kc_default, context_descr, item.label, keymap_data)
 
+        cls._has_keymap_data = True
+
     @classmethod
     def keymap_ui_hierarchy(cls, context_mode):
         # See: bpy_extras.keyconfig_utils