Use "echo" in case if gettext does not exist

[Vadim Kochan]

Ecryptfs-utils scripts uses gettext to show translated info/error messages, but
this might be overhead for some small simple systems where gettext
is not needed, so it would be great if the ecryptfs-utils might support the case
w/o using gettext tool, but use instead simple "echo" wrapper when gettext support
is not needed. The solution might be simple - have some common ecryptfs-functions
script which is included by other and checks at runtime if gettext exists (by
which command) - if does not, then use some simple "echo" wrapper for example:

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#! /bin/sh

GETTEXT_PROG=""
gettext() {
    if [ -z "${GETTEXT_PROG}" ]; then
        GETTEXT_PROG=$(which gettext)
        if [ $? != 0 ]; then
            GETTEXT_PROG=echo
        fi
    fi
    ${GETTEXT_PROG} "$@"
}
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