Ref #71: Add a dialog box instead to prompt for copy path

API/inc/library.hpp

API/src/library.cpp

WebApp/src/app/pages/browse/browse.component.html

...isk-management/copy-contents/copy-contents.component.html

.../disk-management/copy-contents/copy-contents.component.ts

...ages/disk-management/partitions/partitions.component.html

...p/pages/player/music-players/music-players.component.html

...app/pages/player/music-players/music-players.component.ts

WebApp/src/app/shared/dialog/dialog.component.html

WebApp/src/app/shared/dialog/dialog.component.scss

WebApp/src/app/shared/dialog/dialog.component.ts

WebApp/src/app/shared/shared.module.ts

WebApp/src/assets/i18n/en.json

WebApp/src/assets/i18n/zh-hans.json

WebApp/src/assets/i18n/zh-hant.json

scripts/WebApp/check_translations.py