fix typo (#1486)

apps/photos/public/locales/en/translation.json

@@ -38,7 +38,7 @@
     "KEY_GENERATION_IN_PROGRESS_MESSAGE": "Generating encryption keys...",
     "PASSPHRASE_HINT": "Password",
     "CONFIRM_PASSPHRASE": "Confirm password",
-    "REFERRAL_CODE_HINT":"How did you hear abut Ente? (optional)",
+    "REFERRAL_CODE_HINT":"How did you hear about Ente? (optional)",
     "REFERRAL_INFO":"We don't track app installs, It'd help us if you told us where you found us!",
     "PASSPHRASE_MATCH_ERROR": "Passwords don't match",
     "CONSOLE_WARNING_STOP": "STOP!",