Fixed incorrect regular plural for -ves words

Fixes singularization for words like caves (cave), staves (staff).
bug #10909 [PropertyAccess] Fixed plurals for -ves words (csarrazi)

This PR was merged into the 2.3 branch.

Discussion
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[PropertyAccess] Fixed plurals for -ves words

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Fixes singularization for words like caves (cave), staves (staff).

Commits
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c7a77c5 Fixed incorrect regular plural for -ves words