Missing keys: _FieldCaption_XXXX_Search keys

Is it possible that some keys are missing. Some _FieldCaption_XXXX_Search  keys

for height, weight, income and so on

Try manually adding the missing keys from the Admin Panel => Settings => Languages. Here's a how-to on using the language keys system: https://github.com/boonex/dolphin.pro/wiki/Using-Language-Keys-to-Change-Site-Text

I did add them manually. But thank you for you reply. I only wanted to mention this possible bug for further updates.