Function translate_with_fallback 

pub fn translate_with_fallback(
    key: &str,
    translations: &TranslationMap,
    fallback_translations: &TranslationMap,
) -> String

What: Look up translation with fallback to English.

Inputs:

• key: Dot-notation key
• translations: Primary translation map
• fallback_translations: Fallback translation map (usually English)

Output:

• Translated string (from primary or fallback, or key itself if both missing)

Details:

• Tries primary translations first
• Falls back to English if not found
• Returns key itself if neither has translation (for debugging)
• Logs warnings for missing keys (only once per key to avoid spam)