fallback to rough scaling if low memory

// FREEBIE
Merge pull request #1892 from mcginty/bitmap-memory

fallback to imprecise scaling if low memory
Updated translations.

// FREEBIE
Bump version to 2.1.7
Show date and year for ancient (> 1 year old) messages

The timestamp shown for very old messages only includes the time without
a date at all. Fix it. FREEBIE.