Tweak GUI strings for conformity. * libgui/src/files-dock-widget.cc, libgui/src/history-dock-widget.cc: Use "Double-click" instead of "Doubleclick". * libgui/src/m-editor/file-editor.cc: Capitalize breakpoint in menu items. * libgui/src/main-window.cc: Consistently capitalize first letter of all words in menus. * libgui/src/settings-dialog.ui: Capitalize only first letter of options in preferences dialog. * libgui/src/welcome-wizard.cc: Rephrase wizard screen.

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