Spanish translation contains hard-coded version number

The Spanish translation added via GUACAMOLE-463 hard-codes the Apache Guacamole version number as "0.9.13-incubating". This will result in an incorrect version number being displayed when Spanish is selected or on platforms where Spanish is the default language:

{
    
    "NAME" : "Spanish",
    
    "APP" : {

        "NAME"    : "Apache Guacamole",
        "VERSION" : "0.9.13-incubating",
...

The version number should not be defined in the non-English translations at all, relying instead on inheriting the value from the English translation.