Update locale functionality to centos-art.sh script.
    
     - Functions/Locale/locale.sh: Verify current locale information to
       avoid English messages from being localized to themselves.  The
       English language is used as reference to write translatable strings
       inside the source files.
    
       Print action message using the `--as-processing-line' option from
       cli_printMessage function.
    
       Verify whether or not, the directory passed as argument to
       centos-art.sh script supports localization.
    
       Remove definition of L10N_WORKDIR variable here. The value of this
       variable isn't common to all localization cases. The value of this
       variable is redefined for each directory we want to provide
       localization messages for. In each iteration through a directory
       tree, the L10N_WORKDIR variable takes a new value. This variable is
       defined as local to each function environment.
    
     - Functions/Locale/locale_editMessages.sh: Remove verifications
       related to language and localization. They are already done in
       Functions/Locale/locale.sh file.
    
       Define location where translation files will be stored in without
       language information in it. The language information is put later,
       when we build the list of files.
    
       Unify definition of PO_FILES variable. This variable contains the
       list of PO files we want to work with. Previous to this commit the
       way of building this list differed, now it is the same. The
       distinction of whether MO files are created or not still remains
       between Svg and Shell files.
    
       Synchronizations of changes targets to PO files list instead of
       the localization work directory provided. If you don't have the
       parent directories under version control is because you are
       creating these files by the first time because otherwise they must
       be under version control anyway (you download it because they are
       in the repository already, isn't it?). In case you are adding them
       as new files to the repository, be sure to explicitly say so using
       git, before using the --synchronize option of centos-art.sh script.
    
     - Functions/Locale/locale_isLocalizable.sh: Add
       "Documentation/Models/Svg/[[:alnum:]-]+$" as valid path to receive
       localization.
    
     - Functions/Locale/locale_prepareWorkingDirectory.sh: Don't make reference to internal
       variables on errors sent to the user. Probably, they don't know
       what you are talking about.
    
     - Functions/Locale/locale_updateMessageBinary.sh: Update comment typo.
    
     - Functions/Locale/locale_updateMessageShell.sh: Start using
       cli_getLocalizationDir function and rename local variable from
       L10N_DIR to L10N_WORKDIR.
    
     - Functions/Locale/locale_updateMessageXml.sh: Remove separator line.
       Remove path definition to messages file. Include
       "Documentation/Models/Svg/.+$" in the section of files that will be
       localized using the locale_updateMessageXmlSvg function. Don't
       update PO files here. This is something we do deeper (e.g., inside
       local_updateMessageXmlSvg and functions in the same level).
    
     - Functions/Locale/locale_updateMessageXmlDocbook.sh: Define location
       where translation files will be stored in. Define location of the
       file used to create both portable object templates (.pot) and
       portable objects (.po) files. Prepare working directory to receive
       translation files. Verify, initialize or merge portable objects
       from portable object templates.
    
     - Functions/Locale/locale_updateMessageXmlSvg.sh: Update top
       comment. Make this function to work as expected. It looks for svgz
       or svg files inside the target location, extract translatable
       strings and create messages.po files in the related location.
    
     - Functions/Locale/locale_updateMessages.sh: Remove verifications
       related to localization language and localization directory. These
       actions have been done already in Functions/Locale/locale.sh. Don't
       synchronize any changes at this level. A comment was added
       describing why we removed verification related to localization
       directories here.