i18n tool should output the line containing the error

[pburkindine]

🐞 Bug report

• xi18n
• serve
• build

Is this a regression?

No

Description

We receive translated messages.xlf files back from Smartling which sometimes contain mangled ICUs (missing or added closing brackets, mostly). We have thousands of trans-units, and the angular CLI just outputs "Error: Invalid ICU message. Missing '}'." This is true for serve as well as build

Without a reference to the trans-unit or the line in the ICU containing the error, this is a needle in a haystack. Finding it involves combing through the diff one change at a time looking for the ICU that's broken.

🔥 Exception or Error

"Error: Invalid ICU message. Missing '}'."

🌍 Your Environment

╰─ npx ng version                                                                                             2849  10:35:05   

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 10.0.4
Node: 12.16.3
OS: darwin x64

Angular: 10.0.7
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router, service-worker
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.1000.5
@angular-devkit/build-angular     0.1000.4
@angular-devkit/build-optimizer   0.1000.4
@angular-devkit/build-webpack     0.1000.4
@angular-devkit/core              10.0.4
@angular-devkit/schematics        10.0.4
@angular/cdk                      9.2.4
@angular/cli                      10.0.4
@angular/material                 9.2.4
@ngtools/webpack                  10.0.4
@schematics/angular               10.0.4
@schematics/update                0.1000.4
rxjs                              6.5.5
typescript                        3.9.7
webpack                           4.43.0

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