Function applyErrorMessageTemplate

This function applies error messages templates like this:

• Template is a string which contains a variable tags. A variable tag is a a variable name surrounded by %. Eg: %plugin1%
• A variable name is a string of alphanumeric ascii characters.
• Every variable tag is replaced by its value.
• %% is replaced by %.
• Values can't contain variable tags.
• If a variable is not present in the template, but present in the values object, an error is thrown.