* Date entry abbreviations

[ColinMc]

A very minor (but as a result possibly simple request).

When entering two "between" dates, FH is quite restrictive on what it accepts.

• btw 1914 and 1918 is accepted
  
  between 1914 and 1918 is accepted but is immediately displayed as btw 1914 and 1918
  
  btwn is rejected as an "unknown date"
  
  & is rejected as an "unknown date"

As it is one of the date formats that I personally use infrequently, I always forget which is allowed and which is not. Can the list of approved entries be increased to include both "btwn" and "&"?

How they are displayed is of no real concern to me, the current "btw 1914 and 1918" is fine, but on the basis of saving screen and paper space, I'd have no issue if it was changed to "btw 1914 & 1918".