Fix find button in search window

It should use the text filled in the search entry.
And it should not close the window if nothing is found.

review3101003
(transplanted from 8b22f7366f7caeb7ecbe86c28b8b4f8f3bf32627)

--HG--
extra : transplant_source : %8B%22%F76o%7C%AE%B7%EC%BE%86%C2%8B%8BO%8F%3B%F3%26%27
Don't set missing default value to False

False is not always a good valid value for the field, so it is better to let the
field dealing with default value.

issue3643
review3281002
(transplanted from 9a16381241f48ca880e7544edeef54c255c99255)

--HG--
extra : transplant_source : %9A%168%12A%F4%8C%A8%80%E7TN%DE%EFT%C2U%C9%92U
Fix selection of column in next/previous

When _sign is negative, it doesn't select the first column but the second. So
despite of selection the wrong column, it could crash if there is only one
column in the view.

review3241004
(transplanted from f05cc122d3fd52141386f8097d0fc3989b85abd4)

--HG--
extra : transplant_source : %F0%5C%C1%22%D3%FDR%14%13%86%F8%09%7D%0F%C3%98%9B%85%AB%D4
Fix dynamic size for translate widget

Dynamic size was added in changeset 8ee7e142c8fd but the translate widget was
not updated.

review3271004
(transplanted from 1a9e84ba4d48a8e2ca2a98680e2bff1c66aa7791)

--HG--
extra : transplant_source : %1A%9E%84%BAMH%A8%E2%CA%2A%98h%0E%2B%FF%1Cf%AAw%91