Captcha: "Refresh captcha" label still in Svenska even if replaced by English

Description

Steps to reproduce

1. Enable English & svenska for a site.
2. In English, create an EN_Form that contains Captcha & Submit elements.
EN_Form's Replacement Languages setting is:
Visitor Language [svenska] -> Replacement Language [English]

3. Still in English, drag an EN_Form to an EN_Page.
4. Translate EN_Page to svenska [SV_Page].
5. View SV_Page in the browser.

Expected:
Label should be "Refresh Captcha".

Actual:
"Refresh Captcha" label is "Uppdatera captcha".