Make language extensions installable again

Still might want to look into making the native language support work
but for now it seems better not to break backwards compatibility since
the native implementation is quite different.

Author: code-asher

patches/display-language.diff

@@ -14,6 +14,8 @@ We can remove this once upstream supports all language packs.
    one but is worse because it does not handle non-existent or empty files.
 7. Replace some caching and Node requires because code-server does not restart
    when changing the language unlike native Code.
+8. Make language extensions installable like normal rather than using the
+   special set/clear language actions.
 
 Index: code-server/lib/vscode/src/vs/server/node/serverServices.ts
 ===================================================================
@@ -322,3 +324,53 @@ Index: code-server/lib/vscode/src/vs/workbench/services/localization/electron-sa
  		await this.jsonEditingService.write(this.environmentService.argvResource, [{ path: ['locale'], value: locale }], true);
  		return true;
  	}
+Index: code-server/lib/vscode/src/vs/workbench/contrib/extensions/browser/extensionsActions.ts
+===================================================================
+--- code-server.orig/lib/vscode/src/vs/workbench/contrib/extensions/browser/extensionsActions.ts
++++ code-server/lib/vscode/src/vs/workbench/contrib/extensions/browser/extensionsActions.ts
+@@ -318,9 +318,6 @@ export abstract class AbstractInstallAct
+ 		if (this.extension.isBuiltin) {
+ 			return;
+ 		}
+-		if (this.extensionsWorkbenchService.canSetLanguage(this.extension)) {
+-			return;
+-		}
+ 		if (this.extension.state === ExtensionState.Uninstalled && await this.extensionsWorkbenchService.canInstall(this.extension)) {
+ 			this.enabled = this.installPreReleaseVersion ? this.extension.hasPreReleaseVersion : this.extension.hasReleaseVersion;
+ 			this.updateLabel();
+@@ -1785,17 +1782,6 @@ export class SetLanguageAction extends E
+ 	update(): void {
+ 		this.enabled = false;
+ 		this.class = SetLanguageAction.DisabledClass;
+-		if (!this.extension) {
+-			return;
+-		}
+-		if (!this.extensionsWorkbenchService.canSetLanguage(this.extension)) {
+-			return;
+-		}
+-		if (this.extension.gallery && language === getLocale(this.extension.gallery)) {
+-			return;
+-		}
+-		this.enabled = true;
+-		this.class = SetLanguageAction.EnabledClass;
+ 	}
+ 
+ 	override async run(): Promise<any> {
+@@ -1822,17 +1808,6 @@ export class ClearLanguageAction extends
+ 	update(): void {
+ 		this.enabled = false;
+ 		this.class = ClearLanguageAction.DisabledClass;
+-		if (!this.extension) {
+-			return;
+-		}
+-		if (!this.extensionsWorkbenchService.canSetLanguage(this.extension)) {
+-			return;
+-		}
+-		if (this.extension.gallery && language !== getLocale(this.extension.gallery)) {
+-			return;
+-		}
+-		this.enabled = true;
+-		this.class = ClearLanguageAction.EnabledClass;
+ 	}
+ 
+ 	override async run(): Promise<any> {