add support for new Django hashing methods

New Python Django application default to PBKDF2 with SHA256 as a
password mechanism. This adds support for that mechanism in our
password hasher class. Thi

add support for new Django hashing methods

New Python Django application default to PBKDF2 with SHA256 as a
password mechanism. This adds support for that mechanism in our
password hasher class. This will be needed in the tests for the new
PDO auth plugin.

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Remaining plugin translations for Welsh (cy)

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Update lang.php

autor duplicated + < and > fixes.

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minor grammar correction in a comment

Change from _nostring to _other
Permit three values:
- always (default), the other input field is always displayed
- exists, the other input field is only displayed when the setting
contain

Change from _nostring to _other
Permit three values:
- always (default), the other input field is always displayed
- exists, the other input field is only displayed when the setting
contains value(s) not listed in choices*.
- never, the other input field is never displayed. If the setting
contains any value(s) not listed in choices they will be
discarded on saving.
* This means, under normal circumstances the admin will not see
the other input field. It will only appear after manual editing
to enter a non-listed _choice or if an update were to remove a
previously selected _choice

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nostring accepts only on

multicheckbox without extra string input

Undefined offset, initialize as null

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