i18n: how_to: add instructions to regenerate translations The wrap value of '76' is determined empirically by checking the total diff after regeneration using wrap values 70 - 90, using 'wc' to find the smallest delta. It also corresponds with the help text of Weblate that says that the default is to 'wrap at 77 characters'.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}