Fix untranslatable strings (#4132)

Some problem somewhere with [[...]] strings starting with a
leading newline. Should probably be allowed, but for now
fix the few such cases to allow them being translated.

frontend/apps/reader/modules/readerdictionary.lua

@@ -230,8 +230,8 @@ function ReaderDictionary:addToMainMenu(menu_items)
                 text = _("Info on dictionary order"),
                 callback = function()
                     UIManager:show(InfoMessage:new{
-                        text = T(_([[
-If you'd like to change the order in which dictionaries are queried (and their results displayed), you can:
+                        text = T(_(
+[[If you'd like to change the order in which dictionaries are queried (and their results displayed), you can:
 - move all dictionary directories out of %1.
 - move them back there, one by one, in the order you want them to be used.]]), self.data_dir)
                     })