updated example scripts to use darktable translation facilities

examples/multi_os.lua

@@ -70,13 +70,10 @@ local dtsys = require "lib/dtutils.system"  -- system utilities
     translations, inserting this lays the groundwork for anyone who wants to translate the strings.
 ]]
 
-local gettext = dt.gettext
-
--- Tell gettext where to find the .mo file translating messages for a particular domain
-gettext.bindtextdomain("multi_os",dt.configuration.config_dir.."/lua/locale/")
+local gettext = dt.gettext.gettext
 
 local function _(msgid)
-    return gettext.dgettext("multi_os", msgid)
+    return gettext(msgid)
 end
 
 --[[
@@ -187,7 +184,7 @@ local function extract_embedded_jpeg(images)
         end
       else
         dt.print_error(image.filename .. " is not a raw file.  No image can be extracted") -- print debugging error message
-        dt.print(image.filename .. " is not a raw file.  No image can be extracted") -- print the error to the screen
+        dt.print(string.format(_("%s is not a raw file.  No image can be extracted"), image.filename)) -- print the error to the screen
       end
     end
   else
@@ -241,7 +238,7 @@ end
 dt.gui.libs.image.register_action(
   "multi_os", _("extract embedded jpeg"),
   function(event, images) extract_embedded_jpeg(images) end,
-  "extract embedded jpeg"
+  _("extract embedded jpeg")
 )
   
 --[[
@@ -251,7 +248,7 @@ dt.gui.libs.image.register_action(
 dt.register_event(
   "multi_os", "shortcut",
   function(event, shortcut) extract_embedded_jpeg(dt.gui.action_images) end,
-  "extract embedded jpeg"
+  _("extract embedded jpeg")
 )
 
 --[[