Update to version 5.1.5

Changelog:

• bugfix: updating currency rate was not updating file changes (and enable save)
• bugfix: #1689308 category usage count does not get updated for split transactions
• bugfix: #1687117 statistic report filter do not update date range
• bugfix: #1683646 only one changed icon is displayed in accounts window when an internal transfer is edited
• bugfix: #1681532 segfault when pressing escape while editing a new transaction
• bugfix: #1678476 french translation is missing in filter
• bugfix: #1678230 time report show all category may be wrong if split
• bugfix: #1676162 can't set transaction amount to 6 decimal points
• bugfix: #1674020 statistics Report: sorting by amount does not work with "Expenses and Income"
• bugfix: #1672209 account window "0.00" balance sometimes displayed in warning color
• bugfix: #1672205 "Show # days in advance the current date" preference doesn't work
• bugfix: #1672135 BYN - new Belorussian currency is not in the list
• bugfix: #1668036 cannot filter on memo if split transaction
• bugfix: #1667201 original account shows edits when inheriting transaction into another account
• bugfix: #1664916 balance report does not include accounts with no transactions