i18n: Absorb errors from Jed localization

[aduth]

Fixes #5459

This pull request seeks to update localization functions to wrap Jed localization functions, as they throw errors on invalid input, which as can be seen in #5459 causes the entire application to crash. The wrapper absorbs the error, logging it to the console, and returning a sensible default (the untranslated singular string or format).

Testing instructions:

Verify that there are no regressions in the display of localized strings.

Extra credit: Verify that, with an invalid string (e.g. missing placeholder value), no crash occurs and the sensible default is shown.

[bordoni]

Without #5168 we will always hit this console.error().
Should it be logged only once?

[aduth]

Without #5168 we will always hit this console.error().
Should it be logged only once?

Can you elaborate here on what you're expecting? There should be no errors, except in the case where there's a faulty string. The Gutenberg strings assign themselves as the default domain. Other plugins which try to provide a domain which don't exist... will error, yes. Arguably this is the correct behavior, because those domain strings are not available.

[aduth]

In fact, I worry that #5235 may inadvertently cause some plugins to crash the editor without the changes in this pull request, since I've seen in some cases people using __ as it exists in PHP, where we had not previously supported domain and simply ignored it. Now that we support the argument, at least in passing it through to Jed, these would result in errors.

[aduth]

All the same, since it could become noisy, I've added the "log once" behavior in aec58e6.

[aduth]

See #5489 for closure of #5168.