Translation updates for Koha 3.14.11 release

Added new language Khmer.
Bug 12876 - Reserve in waiting/transfer status may be cancelled by user

User may cancel his own reservation at waiting or in transit status
through calling opac-modrequest.pl. Cancel button is disabled in
interface but possibility to cancel should be checked also in
opac-moderequest.pl, before calling CancelReserve().
Similar situation is with opac-modrequest-suspend.pl

This patch provides new soubroutine to chceck if user can cancel given
reserve. It's possible only when he's owner of hold and hold isn't in
transfer or waiting status.

Additionaly there are new test for this function in Reserves.t

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests, QA script and new tests.
Works as described, tested with:
.../cgi-bin/koha/opac-modrequest.pl?reserve_id=XXX

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

Conflicts:
	t/db_dependent/Reserves.t

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit c0ab862f4a902ce261b9b8870c169f6fe27711e1)

Conflicts:
	opac/opac-modrequest-suspend.pl
Bug 12876: Improve unit tests for CanReserveBeCanceledFromOpac

This patch fix the subroutine name and add a restriction on the
arguments: both argument are mandatory!

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

Conflicts:
	t/db_dependent/Reserves.t

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit ea2c5633cdd3e23c5ffd00aef206ab14372cb265)
Bug 12876: (followup) remove useless diags

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 18099ed18a4786896ae9e39cff58c176be95c23e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Update release notes for 3.14.11 release

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Merge remote-tracking branch 'translator/3.14.11-translate' into 3.14.x

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Increment version for 3.14.11 release

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>