Fixed various typos.

Applied patch by snowleopard2 fixing a bunch of typos such as misspellings and double words in the documentation. Combined the patch with some local queued typos waiting to be committed as well as adding new typo fixes inspired by the patch.

Function names with American spelling were not changed nor was third-party code touched. The only code changes involve some changes in strings that are translated ("Can not" -> "Cannot").

Closes #13063 (again).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -3162,7 +3162,7 @@ void wxWindowGTK::SetFocus()
     // within its toplevel", i.e. returns true for one widget per TLW, not
     // globally) returns true immediately after grabbing focus,
     // GTK_WIDGET_HAS_FOCUS (which returns true only for the one widget that
-    // has focus at the moment) takes affect only after the window is shown
+    // has focus at the moment) takes effect only after the window is shown
     // (if it was hidden at the moment of the call) or at the next event loop
     // iteration.
     //