ImportKeys: Add creation date and more check on keys's data

OpenKeychain/src/main/res/values-fi/strings.xml

@@ -253,7 +253,7 @@
   <string name="label_cert_type">Tyyppi</string>
   <string name="key_no_passphrase">ei salasanaa</string>
   <string name="key_unavailable">ei saatavilla</string>
-  <string name="unknown_algorithm">tunnistamaton</string>
+  <string name="unknown">tunnistamaton</string>
   <string name="contact_show_key">Näytä avain (%s)</string>
   <string name="key_colon">Avain:</string>
   <!--Android Account-->