[Cashtab] Disable localization in unit tests
Summary:
Related to T2088
Ensure that unit tests are run in a fixed locale. This prevents users in different locales from changing snapshot files, for example . going to , for decimal indicator.
Test Plan:
0. Be in France
- Alter text in Send.js, for example "Are you sure you want to send" to "Are you sure you want to test"
- npm test (update snapshot when prompted)
- Confirm . is used for decimal indicator even if run from France
Reviewers: Fabien, #bitcoin_abc
Reviewed By: Fabien, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D10787