Opigno forum (8.x-1.9) - en to unknown language translation catalogue (5 entries)

en: Forum
target: 论坛

en: Forums
target: 论坛

en: Forum topic
target: 讨论版主题

en: A <em>forum topic</em> starts a new discussion thread within a forum.
target: 开始在论坛中进行新的<em>论坛主题</em>的讨论

en: Forum navigation vocabulary
target: 论坛导航词汇表
