Hi,
You can enable the "Hide content from Live/Preview" option in the "Configure Formatting Tags" window. This hides everything between your formatting tags in the Stage View.
Assuming your secondary language is on a second line, there's another thing I’d suggest:
The line breaks are currently outside the formatting tags, which results in an empty line being displayed in the Stage View. To avoid that, you can include the line break within the formatting tag configuration and write both lines on a single line while editing the song.
Here are some screenshots to clarify what I mean:
Without line break in configuration:
With line break in configuration:
