Askable does not require participants to provide ethnicity or language data as part of their profile. If you require understanding of which ethnicity or languages a participant may use, consider including as a screener. Here are some examples used by other Customers, which you should consider amending for your purposes.
Ethnicity screeners
Offer a broad range of categories and always include an "Other" option so no one is forced into a box that doesn't fit.
What is your ethnic background? African · Asian · Caucasian/White · Hispanic/Latino/Latina · Native American/Indigenous · Pacific Islander · Middle Eastern · Mixed/Multiracial · Other (please specify)
Or, with categories common in US research:
Which racial or ethnic group do you identify with? White · Black or African American · Asian · Native American or Alaska Native · Native Hawaiian or Other Pacific Islander · Hispanic or Latino/Latina · Middle Eastern or North African · Multiracial · Other (please specify)
If you include an "Other (please specify)" option, add a short answer question after it: "If you chose Other in the previous question, please specify." Remember that short answer responses carry no eligibility weight; you will need to manually read the other selections.
Mark the groups you need as approve and the rest as reject. Broad option lists like these also keep the question from leading applicants.
Ethnicity can be a sensitive topic for some audiences, so consider starting your screener with a notice and including a "Prefer not to say" option where it fits your research.
Language screeners
The Languages targeting on the Recruit tab matches only the languages participants have listed on their profiles. Profiles don't always capture every language someone speaks, so if a language is essential to your study, back it up with a screener question:
Which of the following languages do you speak fluently? (multi-select) English · Mandarin · Cantonese · Vietnamese · Arabic · Spanish · Hindi · Punjabi · Greek · Italian · Other (please specify)
Adjust the list to your market, mark the language you need as approve, and keep several plausible alternatives in the list so the question doesn't give away what you're looking for.
If the session itself will run in another language, say so in your study description so applicants know what to expect.