upload only public key in revocation

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

@@ -1096,6 +1096,7 @@
     <string name="msg_ed_caching_new">"Caching new password"</string>
     <string name="msg_ed_error_no_parcel">"Missing SaveKeyringParcel! (this is a bug, please report)"</string>
     <string name="msg_ed_error_key_not_found">"Key not found!"</string>
+    <string name="msg_ed_error_extract_public_upload">"Error extracting public key for upload!"</string>
     <string name="msg_ed_fetching">"Fetching key to modify (%s)"</string>
     <string name="msg_ed_success">"Key operation successful"</string>