AFAIK there is no way to find only String[] properties. I suggest to use Sling / JCR API to execute query and find all nodes with your property and then iterate through result and filter multi-valued properties.

Hi,Do you know the name of your property?Is it always multi-value?If yes, just search for nodes with your property nameExample: SELECT * FROM [cq:PageContent] AS s WHERE ISDESCENDANTNODE([/content/geometrixx-outdoors]) and [jcr:mixinTypes] is not null

Try to remove "-" from i18n key name.Try to use CQ.I18nDebug

Have you checked if your i18n works on JSP/Java? If it works there - I have no answer.If not - make sure use set your dictionary correctly under /apps/your-app/i18n. Also, your page should be under /content/your-app/...