Metadata (update date and bytes size) do not have labels

[VojtaStanek]

Current Behavior

On the frontend some of the metadata do not have any labels. It may not be understandable what:

• the date means (first crate publish or latest version?),
• the number of bytes mean

On mobile there is for MSRV since hover does not work well on mobile.

Expected Behavior

It should be understandable what each item means - it should have labels such as "Last update" or "Download size" (or whatever the bytes mean).

Steps To Reproduce

1. Go to https://crates.io/crates/syn
2. Look to the sidebar

Environment

• Browser: MS Edge
• OS: Windows

Anything else?

No response

[kishore08-07]

@rustbot claim
I would like to work on this issue.

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