Monospace last online placeholder

[encode42]

Currently, the "last online" placeholder's length will vary depending on the displayed date. This doesn't work with MOTDs that are heavily reliant on the width of its contents. The solution would be a monospaced date placeholder that somehow keeps the same width no matter the displayed date.

Here's an example of a MOTD that would break with varying placeholder widths:

If the last joined date was Oct 10, the width of the MOTD will change and destroy the alignment.