Add DBDuplicateEntry detection for mysqlconnector driver

Actually, adjust the mysql regex to match on the "Duplicate entry 'foo'
for key 'bar'" error string that is presumably buried deep within mysqld
itself, with less regard to specific punctuation.
Hopefully this will be portable between all mysql drivers.

Change-Id: I241c5cb61a6335857942bf79ee2301ae0c94ff6e
Allow usage of several iterators on ModelBase

Storing iterator object as attribute of model doesn't allow
to use several iterators at the same time

Now the new Iterator object which is created by iter()
stores model object, and in such way several iterators can be
created and work without interfering

Change-Id: I5806877a2d15d449b948307a522bf2fb56bf8110
Imported Translations from Transifex

Change-Id: I825432e1c9990b2c2b825ff84eef8d58b64f7b91
Merge "Allow usage of several iterators on ModelBase"
Merge "Imported Translations from Transifex"
Merge "Add DBDuplicateEntry detection for mysqlconnector driver"