Most Libraries' search tools have limiters that let you filter your results to only things in a specific language. Often, these are available in an Advanced Search interface or in a list of limiters on a results page.
EBSCO Discovery Service and all EBSCO databases both include a Language drop-down menu in Advanced Search as well as a "Filter by Language" option in the left column of the results page.
Classic Catalog has a language drop-down menu in the Advanced Search under "Add Limits (Optional).
