Remove unrelated translations from master lang_en.txt as well

lang/lang_en.txt

@@ -877,9 +877,6 @@
 #
 "Unload"
 
-#
-"Sheet %.7s\x0aZ offset: %+1.3f mm\x0a%cContinue\x0a%cStart from zero"
-
 #MSG_TOTAL_FAILURES c=20
 "Total failures"