Merge pull request #160 from gdrooid/master

[i18n] Updated pot and po files.
switched to zsh/regex and zsh/mapfile

many operations moved to builtin zsh internals, improving speed
also fixes to the username detection and to the losetup check
removed some minor debugging tests
work also without gettext. versioning
installs also translated strings
updated ChangeLog on upcoming release
more detailed help messages and exclude videos from index
this should fix lo_mount() as reported in #154
avoid gettext being a requirement and list optional tools found in version output
using zsh hash function instead of command -v to check for bins in path, using plain 2>/dev/null redirection everywhere
reverted to use command -v instead of hash

according to analysis made with @gdrooid
added also explicit stdout redirection to command -v