ng extract-i18n extracts incorrect `equiv-text` value

🐞 bug report

Affected Package

The issue is caused by package @angular/localize

Is this a regression?

Yes, the previous version in which this bug was not present was: v10

Description

Component template (it's usually formatted like this by prettier):

<div i18n>
  test {{ title }}
</div>

Running ng xi18n in angular v10, produced output that contained source element that looked:

<source>
   test <x id="INTERPOLATION" equiv-text="{{ title }}"/>
</source>

Now after running ng extract-i18n it's:

<source> test <x id="INTERPOLATION" equiv-text="t {{ title "/>
</source>

🔬 Minimal Reproduction

https://github.com/kamilchlebek/equiv-text-angular11 (see messages.xlf)

🌍 Your Environment

(it's a brand new project created using ng new)

Angular Version:

Angular CLI: 11.0.1
Node: 12.16.1
OS: linux x64

Angular: 11.0.0
... animations, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1100.1
@angular-devkit/build-angular   0.1100.1
@angular-devkit/core            11.0.1
@angular-devkit/schematics      11.0.1
@angular/cli                    11.0.1
@schematics/angular             11.0.1
@schematics/update              0.1100.1
rxjs                            6.6.3
typescript                      4.0.5