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>

.gitignore

@@ -22,6 +22,9 @@ npm-debug.log
 *.bak
 *.po~
 
+# Compiled translations (built by CI/CD release workflow)
+*.mo
+
 # Claude local settings
 .claude/settings.local.json