fix: standardize translation file names and add 11 new locales (v1.0.5)

- Rename all .po files to use wp-bootstrap- prefix (WordPress convention)
- Add 11 new locale translations (de_CH_informal, de_DE, de_DE_informal,
  en_GB, es_ES, fr_CH, it_CH, it_IT, nl_NL, pl_PL, pt_PT)
- Total: 13 locales + en_US base = 14 supported languages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

style.css

@@ -7,7 +7,7 @@ Description: A modern WordPress Block Theme built from scratch with Bootstrap 5.
 Requires at least: 6.7
 Tested up to: 6.7
 Requires PHP: 8.3
-Version: 1.0.4
+Version: 1.0.5
 License: GNU General Public License v2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Text Domain: wp-bootstrap