Exclude i18n resources from plugin

[demon101]

Please, exclude grails-app/i18n folder from jar build
In current grails version 3.2.11 order of i18n loading not determined.

Please add exclude to jar build or just delete this files from src

[zyro23]

bump. also faced this.

application only defines one messages.properties but this plugins' locale-specific messages_xyz.properties takes precedence, thus overriding our customized values.

thanks!