REFEDIT: nested pick messages and the session note

Picking nested objects reports what each pick added ("1 entity added",
"0 entities added" for an object already in the set), a pick on empty
space starts a window ("Specify opposite corner:"; a window dragged to
the right takes the objects inside it, to the left those it touches),
and a typed point picks the object it lies on. From the Reference Edit
dialog the item count is printed when the session opens, followed by
"Use REFCLOSE or the Refedit toolbar to end reference editing session."

Co-Authored-By: Claude Opus 5.5 <[email protected]>

locales/ru-RU/opencadstudio.ftl

@@ -6474,6 +6474,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Добавить в рабочий набор
     .remove-from-working-set = Удалить из рабочего набора
     .toolbar-objects = объектов