Fixed a series of l18n bugs

Added comments for translators; added context to some strings;
added ellipses to some menu commands; renamed the File menu to
Archive.

Bugs fixed: 611220 611226 611356 611332 611357 611359 611360
611361 611365 611366 611367 611368 611369 611370 611371
611372 611375 611376 611380 611381 611392 614521