These tests were relying upon unix-like paths, which
caused them to fail on Windows.
Note that the `filegroup` Bazel rule tends not to work well
on Windows, so this has been replaced with `copy_to_bin`
instead.
PR Close#40952
Some translation file formats would like to be able to render the
text of placeholders taken from the original source files. This commit
adds this information to the extracted messages so that it can be
used in translation file serializers.
PR Close#38536
Previously, if `useLegacyIds` was enabled, the message extractor
was always rendering the legacy message ids in translation
files even if an explicit "custom message id" had been provided
in the original message.
PR Close#38498
This tool, which can be run from the node_modules bin folder, can parse
the source files in your compiled app and generate a translation file
formatted with the configured syntax.
For example:
```
./node_modules/.bin/localize-extract -s 'dist/**/*.js' -f xliff1 -o dist/messages.en.xlf
```
PR Close#32912
