Adding a variable to some PHP code with gettext

Use sprintf():

// Translators: %s: author's current year.
esc_html( sprintf( __('Rates %s in €/ week:','mysite-plugin'), $current_year ) );

This is a common pattern that can be found in WordPress core. The Translators: comment is also essential to provide translators with context to translate the passage and understand what the placeholder %s will contain.

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