build: add src/cut.c to the list of files with translatable strings

(Also, adjust the style of one of the messages.)

This fixes https://savannah.gnu.org/bugs/?56083.

Bug existed since version 4.0, commit 50e8f8aa.

po/POTFILES.in

@@ -2,6 +2,7 @@
 
 src/browser.c
 src/color.c
+src/cut.c
 src/files.c
 src/global.c
 src/help.c

src/cut.c

@@ -478,7 +478,7 @@ void do_uncut_text(void)
 		/* The leftedge where we started the paste. */
 
 	if (cutbuffer == NULL) {
-		statusbar(_("The cutbuffer is empty"));
+		statusbar(_("Cutbuffer is empty"));
 		return;
 	}