[client] po: update paths, add kswitch
[client] update translations
[server] update translations
[rigo] update translations
[entropy.client] add .ini like repositories.conf.d/ files support

    This is backward compatible with the previous repository
    implementation, in the sense that old repository syntax
    is just ignored. However, a mix of old and new statements
    may result in an undefined behaviour.

    This is an example of the new syntax (with a complete listing
    of the supported arguments):

    [sabayon-limbo]
    desc = Sabayon Linux Official Testing Repository
    repo = http://pkg.sabayon.org,sabayon.org
    pkg = http://pkg.sabayon.org
    pkg = http://dl.sabayon.org/entropy
    enabled = <true/false>

    [sabayon-limbo]
    desc = This statement will be ignored.
    repo = This url will be ignored.
    pkg = http://some.more.mirror.org/entropy
    pkg = http://some.more.mirror.net/entropy

    As you can see, multiple statements for the same repository
    are allowed. However, only the first desc = and repo =
    statements will be considered, while there can be as many pkg =
    as you want.

    Statements description:
    - "desc": stands for description, the repository name description.
    - "repo": the repository database URL string, plus other parameters
              as supported in the previous configuration file syntax:
              <db url prefix>[,<remote web services server url][#<compression>].
    - "pkg": the repository packages URL string. This must be a valid URL.
             The supported protocols are those supported by entropy.fetchers.
    - "enabled": if set, its value can be either "true" or "false". The default
                 value is "true". It indicates if a repository is configured
                 but currently disabled or enabled. Please take into account
                 that config files in /etc/entropy/repositories.conf.d/ starting
                 with "_" are considered to contain disabled repositories. This
                 is just provided for convienence.
[entropy.core] properly pass encoding= to RepositoryConfigParser