The wording of microwable/grillable/processable outputs now takes into
accounts plurals.
For example, the examine text for an onion slice is now: "The onion
slices can be baked into _some_ onion rings", rather than "an onion
rings".
- Examining microwavable things now uses "can be", rather than "could
be"; the same verb as bakeable and griddlable.
- Processing atoms now uses `plural_s()` rather than just a flat `/s`,
which is unreliable.
- The use of `<b>` tags has been changed to `span_bold()`.
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