要在Angular中实现本地化的formControlName，使用点表示法表示千位数和逗号表示小数点，可以按照以下步骤进行：

1. 首先，安装@ngx-translate/core和@ngx-translate/http-loader依赖项，以便在Angular中进行本地化。

   npm install @ngx-translate/core @ngx-translate/http-loader --save
   

2. 在app.module.ts文件中导入所需的模块和服务，并配置TranslateModule和TranslateHttpLoader。

   import { BrowserModule } from '@angular/platform-browser';
   import { NgModule } from '@angular/core';
   import { AppComponent } from './app.component';
   import { FormsModule, ReactiveFormsModule } from '@angular/forms';
   import { HttpClientModule, HttpClient } from '@angular/common/http';
   import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
   import { TranslateHttpLoader } from '@ngx-translate/http-loader';
   
   export function HttpLoaderFactory(http: HttpClient) {
     return new TranslateHttpLoader(http);
   }
   
   @NgModule({
     declarations: [
       AppComponent
     ],
     imports: [
       BrowserModule,
       FormsModule,
       ReactiveFormsModule,
       HttpClientModule,
       TranslateModule.forRoot({
         loader: {
           provide: TranslateLoader,
           useFactory: HttpLoaderFactory,
           deps: [HttpClient]
         }
       })
     ],
     providers: [],
     bootstrap: [AppComponent]
   })
   export class AppModule { }
   

3. 在app.component.ts文件中导入FormControl和TranslateService，并在组件的构造函数中注入TranslateService。

   import { Component } from '@angular/core';
   import { FormControl } from '@angular/forms';
   import { TranslateService } from '@ngx-translate/core';
   
   @Component({
     selector: 'app-root',
     template: `
       
   
         
       
     `
   })
   export class AppComponent {
     myForm = new FormGroup({
       amount: new FormControl()
     });
   
     constructor(private translate: TranslateService) {
       this.translate.setDefaultLang('en'); // 设置默认语言
     }
   }
   

4. 在app.component.html文件中使用translate指令来本地化表单控件的placeholder属性，并使用自定义管道来格式化输入的值。

5. 创建一个translate.pipe.ts文件，定义一个TranslatePipe管道来格式化输入的值。

   import { Pipe, PipeTransform } from '@angular/core';
   import { TranslateService } from '@ngx-translate/core';
   
   @Pipe({
     name: 'translate'
   })
   export class TranslatePipe implements PipeTransform {
     constructor(private translate: TranslateService) { }
   
     transform(value: any): any {
       if (value == null) return '';
       let formattedValue = parseFloat(value).toLocaleString(this.translate.currentLang, {
         maximumFractionDigits: 2,
         minimumFractionDigits: 2
       });
       return formattedValue;
     }
   }
   

6. 在app.module.ts文件中将TranslatePipe添加到declarations数组中。

   import { BrowserModule } from '@angular/platform-browser';
   import { NgModule } from '@angular/core';
   import { AppComponent } from './app.component';
   import { FormsModule, ReactiveFormsModule } from '@angular/forms';
   import { HttpClientModule, HttpClient } from '@angular/common/http';
   import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
   import { TranslateHttpLoader } from '@ngx-translate/http-loader';
   import { TranslatePipe } from './translate.pipe';
   
   export function HttpLoaderFactory(http: HttpClient) {
     return new TranslateHttpLoader(http);
   }
   
   @NgModule({
     declarations: [
       AppComponent,
       TranslatePipe
     ],
     imports: [
       BrowserModule,
       FormsModule,
       ReactiveFormsModule,
       HttpClientModule,
       TranslateModule.forRoot({
         loader: {
           provide: TranslateLoader,
           useFactory: HttpLoaderFactory,
           deps: [HttpClient]
         }
       })
     ],
     providers: [],
     bootstrap: [AppComponent]
   })
   export class AppModule { }
   

7. 创建一个en.json文件（或其他语言的本地化文件）来定义翻译字符串