The Image.properties file (see Images) can be localized as per other properties files, please see Locales for more information on localizing properties files. Once the localized properties file is created, place this beside the Image.properties file.
It is useful to note that if the application does not find a particular property in a localized properties file, it will check the default locale properties file. This is generally true for all properties files but it is particularly useful in the case of Image.properties. You might find that some of your images can be used no matter what language is displayed, whereas other images contain text and thus must be altered. It is only these latter images that need to be mentioned in the localized properties file.