Hi,
The strings can be changed by using loco translate plugin https://wordpress.org/plugins/loco-translate/
You will need to go to the plugin dashboard and in Sweetdate section add new language, choose your language, and if you are asked where you want to save the language files choose global language directory ( wp-content/languages/ ) then press SYNC button then search for that string and translate it and press save.
If the strings that are you looking for are not found in Sweetdate try to search it on buddypress.
Cheers
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