[framework] fix incorrect chinese localizations for Search Web and Share in selection controls (#144857)

Fixes https://github.com/flutter/flutter/issues/144825

Corresponding translation suggestions:

https://tc.corp.google.com/btviewer/edittranslation?project=Flutter&msgId=7417055026368500447&language=zh-TW
(I accidentally pressed submit 3 times :( )

https://tc.corp.google.com/btviewer/edittranslation?project=Flutter&msgId=7417055026368500447&language=zh-HK

https://tc.corp.google.com/btviewer/edittranslation?project=Flutter&msgId=7417055026368500447&language=zh-CN

https://tc.corp.google.com/btviewer/edittranslation?project=Flutter&msgId=8883913494819754382&language=zh-CN

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [relevant style guides] and ran the
auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages
repo does use `dart format`.)
- [x] I signed the [CLA].
- [x] The title of the PR starts with the name of the package surrounded
by square brackets, e.g. `[shared_preferences]`
- [x] I [linked to at least one issue that this PR fixes] in the
description above.
- [x] I updated `pubspec.yaml` with an appropriate new version according
to the [pub versioning philosophy], or this PR is [exempt from version
changes].
- [x] I updated `CHANGELOG.md` to add a description of the change,
[following repository CHANGELOG style].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] All existing and new tests are passing.