SVGHMI: allow i18n of formated strings of HMI:Messages. This was by construction impossible since formating was given as an argument. Now added optional "format" labelled element in HMI:Display, so that it can be translated, when labelled "_format".
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR ORGANIZATION
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"POT-Creation-Date: 2021-02-14 19:05+CET\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Generated-By: SVGHMI 1.0\n"
#:svghmi.svg: format:text424
msgid "height is %d meters"
msgstr ""
#:svghmi.svg: formatfortext:text5271
msgid "This is an integer value : %d"
msgstr ""
#:svghmi.svg: someothertext:text5267
msgid "Some \"other\" ČĆĐš english text"
msgstr ""
#:svghmi.svg: sometext:text5283
msgid ""
"Some english text\n"
"another line\n"
"a third one"
msgstr ""