* doc/msgcat.n: Clarified message catalog file encodings. [Bug 811457]

        * library/msgcat/msgcat.tcl:
        Updated internals to make use of [dict]s to store message catalog
        data and to use [source -encoding utf-8] to access catalog files.
        Thanks to Michael Sclenker.  [Patch 875055, RFE 811459]
        Corrected [mcset] to be able to successfully set a translation to
        the empty string.  [mcset $loc $src {}] was incorrectly set the
        $loc translation of $src back to $src.  Also changed [ConvertLocale]
        to minimally require a non-empty "language" part in the locale value.
        If not, an error raised prompts [Init] to keep looking for a valid
        locale value, or ultimately fall back on the "C" locale. [Bug 811461].
        * library/msgcat/pkgIndex.tcl:  Bump to msgcat 1.4.1.

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