(svn r24875) -Fix: grammatical error (Superuser)

src/lang/english.txt

@@ -2102,7 +2102,7 @@ STR_CONTENT_DETAIL_FILESIZE                                     :{SILVER}Downloa
 STR_CONTENT_DETAIL_SELECTED_BECAUSE_OF                          :{SILVER}Selected because of: {WHITE}{RAW_STRING}
 STR_CONTENT_DETAIL_DEPENDENCIES                                 :{SILVER}Dependencies: {WHITE}{RAW_STRING}
 STR_CONTENT_DETAIL_TAGS                                         :{SILVER}Tags: {WHITE}{RAW_STRING}
-STR_CONTENT_NO_ZLIB                                             :{WHITE}OpenTTD is build without "zlib" support...
+STR_CONTENT_NO_ZLIB                                             :{WHITE}OpenTTD is built without "zlib" support...
 STR_CONTENT_NO_ZLIB_SUB                                         :{WHITE}... downloading content is not possible!
 
 # Order of these is important!