fix(@angular-devkit/build-angular): make i18n translation files relative to workspace

All other paths within the workspace file are relative to the workspace root.

Author: clydin

packages/angular_devkit/build_angular/src/utils/i18n-options.ts

@@ -166,7 +166,7 @@ export async function configureI18nBuild<T extends BrowserBuilderSchema | Server
     const usedFormats = new Set<string>();
     for (const [locale, desc] of Object.entries(i18n.locales)) {
       if (i18n.inlineLocales.has(locale) && desc.file) {
-        const result = loader(path.join(projectRoot, desc.file));
+        const result = loader(path.join(context.workspaceRoot, desc.file));
 
         for (const diagnostics of result.diagnostics.messages) {
           if (diagnostics.type === 'error') {