Fix room name overflow in room list

Resolves #61 (closed)

Checklist | 检查清单

Before marking this merge request as Ready, the following must be done:

在把这个合并请求标记成就绪之前，这些东西必须完成：

• The code must compile. Preferably, each commit should compile.

  代码必须能编译。最好每个提交都能编译。

• [n/a] Any added UI text must be translated via l10n.get(). The messages must be translated into every core language: en, cmn.

  任何添加的 UI 文字都要用 l10n.get() 翻译。 讯息必须翻译成所有核心语言：en，cmn。

  • [n/a] The merge request creator must translate each message into one of the core languages. The others can be handled by others.

    开合并请求的人必须把每条讯息翻译成一种核心语言。 别的可以给别人做。

• If the merge request contains a user-visible change, it must have a changelog.

  如果这个合并请求包括对用户可见的更改，必须写个更改记录。