feat(web): translate combat log, action buttons, and victory/defeat screen to English
Translates formatEvent() and monsterIntentLabel() combat-log templates,
default participant-name fallbacks (Du/Der Gegner -> You/The enemy), and
every static string in the combat page template: round header, action
buttons, outcome headings, rewards panel, post-combat buttons, log panel,
and loading/error/aria-label text.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ACkMEDYiwtcfchqKkiUJNX
0923fc0a23