Make 'default' and 'fallback' strings translatable

frontend/apps/reader/modules/readerfont.lua

@@ -212,11 +212,11 @@ function ReaderFont:makeDefault(face)
         UIManager:show(MultiConfirmBox:new{
             text = T( _([[Set %1 as default or fallback font? The fallback font ]] 
                       ..[[displays characters not found in the active font.]]), face),
-            choice1_text = ("Default"),
+            choice1_text = _("Default"),
             choice1_callback = function()
                 G_reader_settings:saveSetting("cre_font", face)
             end,
-            choice2_text = ("Fallback"),
+            choice2_text = _("Fallback"),
             choice2_callback = function()
                 G_reader_settings:saveSetting("fallback_font", face)
             end,

frontend/ui/widget/multiconfirmbox.lua

@@ -27,8 +27,8 @@ local MultiConfirmBox = InputContainer:new{
     modal = true,
     text = _("no text"),
     face = Font:getFace("infofont", 25),
-    choice1_text = _("Choice1"),
-    choice2_text = _("Choice2"),
+    choice1_text = _("Choice 1"),
+    choice2_text = _("Choice 2"),
     cancel_text = _("Cancel"),
     choice1_callback = function() end,
     choice2_callback = function() end,