[Qt] misc small fixes for #3099 (new receive flow)

- changes some strings that were forgotton or made no sense in the conext
  they are used
- remove an orphan file from the qt project file
- revert a small change in signverifymessagedialog.ui
- guard #include "bitcoin-config.h" with #if defined(HAVE_CONFIG_H)
- remove windowTitle from addressbookpage.ui
- remove an obsolete connection to a signMessage() signal