Add support for Italian and update language files.

resources/lang/it_IT/config.php

@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+/**
+ * config.php
+ * Copyright (c) 2017 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+return [
+    'html_language'    => 'it',
+    'locale'           => 'it, Italiano, it_IT, it_IT.utf8, it_IT.UTF-8',
+    'month'            => '%B %Y',
+    'month_and_day'    => '%e %B %Y',
+    'date_time'        => '%e %B %Y, @ %T',
+    'specific_day'     => '%e %B %Y',
+    'week_in_year'     => 'Week %W, %Y',
+    'year'             => '%Y',
+    'half_year'        => '%B %Y',
+    'month_js'         => 'MMMM YYYY',
+    'month_and_day_js' => 'Do MMMM YYYY',
+    'date_time_js'     => 'Do MMMM YYYY, @ HH:mm:ss',
+    'specific_day_js'  => 'D MMMM YYYY',
+    'week_in_year_js'  => '[Week] w, YYYY',
+    'year_js'          => 'YYYY',
+    'half_year_js'     => 'Q YYYY',
+];