Docker atlassian/confvluence-server missing fonts

[pmextra]

Related issue: https://confluence.atlassian.com/confkb/non-ascii-characters-display-as-square-characters-in-confluence-317948797.html

The above problem was occurred in `atlassian/confluence-server:latest`, it's the case 1.

I think the official image should build with all language support (or provided another image tag that with all language support).

I found a way to do that:

```

apt install -y language-selector-common
check-language-support -a | xargs apt install -y

```

I'm not sure it's the best solution but it's solved my problem.