wikipedia: fix languages rotation and query

Fix innacurate language query and rotation when back from nested lookups.
More informative lookup message (langage used, search or full page)
Allow for screen refresh with diagonal swipe (like in readerpaging).

frontend/apps/reader/modules/readerwikipedia.lua

@@ -11,7 +11,6 @@ local ReaderWikipedia = ReaderDictionary:extend{
     is_wiki = true,
     wiki_languages = {},
     no_page = _("No wiki page found."),
-    lookup_msg = _("Searching Wikipedia for:\n%1")
 }
 
 function ReaderWikipedia:init()
@@ -88,6 +87,13 @@ function ReaderWikipedia:onLookupWikipedia(word, box, get_fullpage)
     if word == "" then
         return
     end
+
+    -- Fix lookup message to include lang
+    if get_fullpage then
+        self.lookup_msg = T(_("Getting Wikipedia %2 page:\n%1"), "%1", lang:upper())
+    else
+        self.lookup_msg = T(_("Searching Wikipedia %2 for:\n%1"), "%1", lang:upper())
+    end
     self:onLookupStarted(word)
     local results = {}
     local ok, pages