Elements List dialog: Remove the accelerator key on the "Activate" bu…

…tton (#6167) (#12369)

Fixes #6167

Summary of the issue:
In the English locale, there is an accelerator key collision between the "Annotation" element type and the "Activate" button, both set to the letter "A".
In the French locale, there is collision between the element type "Form field" ("Champs de formulaire") and the same button ("Activer"), both set to the letter "C".
This changes the behavior of the accelerator key that focuses the radio button but does not activate it.
This is not a bug at all, but is not ergonomically optimum, especially for less advanced users.

Description of how this pull request fixes the issue:
As suggested by @Qchristensen, remove the accelerator key setting from the "Activate" button as it is, when available, the default action of the dialog upon pressing the enter key.
In most locale, this change should not raise the need for a new translation, as the "Activate" label already exists without an accelerator marker as "a message reported when the action at the position of the review cursor or navigator object is performed.".
Just to be sure, I also added a warning in the translators comment for the button label to ask them to beware of the risk of collision.

source/browseMode.py

@@ -972,9 +972,10 @@ def __init__(self, document):
 		contentsSizer.AddSpacer(gui.guiHelper.SPACE_BETWEEN_VERTICAL_DIALOG_ITEMS)
 
 		bHelper = gui.guiHelper.ButtonHelper(wx.HORIZONTAL)
-		# Translators: The label of a button to activate an element
-		# in the browse mode Elements List dialog.
-		self.activateButton = bHelper.addButton(self, label=_("&Activate"))
+		# Translators: The label of a button to activate an element in the browse mode Elements List dialog.
+		# Beware not to set an accelerator that would collide with other controls in this dialog, such as an
+		# element type radio label.
+		self.activateButton = bHelper.addButton(self, label=_("Activate"))
 		self.activateButton.Bind(wx.EVT_BUTTON, lambda evt: self.onAction(True))
 
 		# Translators: The label of a button to move to an element