4.5.1

- Update URLs. Remove ref. to translations.x.o (Bug #16162)
- Allow compilation with panel 4.15
- Replace GtkStock buttons
- Improve spacing (Bug #14664)
- Make build less verbose
- AC_CONFIG_MACRO_DIR -> AC_CONFIG_MACRO_DIRS
- Translation Updates:
  Albanian, Amharic, Arabic, Armenian (Armenia), Asturian, Basque,
  Belarusian, Bulgarian, Catalan, Chinese (China), Chinese (Taiwan),
  Croatian, Czech, Danish, Dutch, English (Australia), English (United
  Kingdom), Esperanto, Estonian, Finnish, French, Galician, German,
  Greek, Hebrew, Hungarian, Icelandic, Indonesian, Italian, Japanese,
  Kazakh, Korean, Latvian, Lithuanian, Malay, Norwegian Bokmål, Occitan
  (post 1500), Polish, Portuguese, Portuguese (Brazil), Romanian,
  Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish,
  Uighur, Ukrainian, Urdu, Urdu (Pakistan)
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