chore: remove unused Spanish translation files

1. Deleted dde-session-shell_es_419.ts (Latin American Spanish)
2. Deleted dde-session-shell_es_AR.ts (Argentinian Spanish)
3. Deleted dde-session-shell_es_CL.ts (Chilean Spanish)
4. Deleted dde-session-shell_es_MX.ts (Mexican Spanish)

Log: as title

Author: yixinshark