Shiny Updates: Different strings for plugins and themes (take 2)

[SergeyBiryukov]

Background: #37290

Since [38057], some plugin and theme install/update strings have a context to allow for differentiation between theme and plugin translations.

Some strings, however, are still used for both plugins and themes, e.g. "Updated!". They should have a context as well.

[SergeyBiryukov]

In 40034:

Update/Install: Give context to some more install/update strings to allow for differentiation between theme and plugin translations.

Fixes #39747. See #37290.

[swissspidy]

What about the "Deleted!" string? "Updated!" is used with different context already.

[SergeyBiryukov]

Replying to swissspidy:

What about the "Deleted!" string?

Good point, missed it.

[SergeyBiryukov]

In 40035:

Update/Install: Give context to "Deleted! string to allow for differentiation between theme and plugin translations.

Props swissspidy.
See #39747. See #37290.