correct error throwing in apiclient and add extension point

scm-plugins/scm-git-plugin/src/main/js/GitMergeInformation.js

@@ -0,0 +1,55 @@
+//@flow
+import React from "react";
+import type { Repository } from "@scm-manager/ui-types";
+import { translate } from "react-i18next";
+
+type Props = {
+  repository: Repository,
+  target: string,
+  source: string,
+  t: string => string
+};
+
+class GitMergeInformation extends React.Component<Props> {
+  render() {
+    const { source, target, t } = this.props;
+
+    return (
+      <div>
+        <h4>{t("scm-git-plugin.information.merge.heading")}</h4>
+        <h5>{t("scm-git-plugin.information.merge.subheading")}</h5>
+        {t("scm-git-plugin.information.merge.clean")}
+        {t("scm-git-plugin.information.merge.checkout")}
+        <pre>
+          <code>git checkout {target}</code>
+        </pre>
+        {t("scm-git-plugin.information.merge.update")}
+        <pre>
+          <code>
+            git pull
+          </code>
+        </pre>
+        {t("scm-git-plugin.information.merge.merge")}
+        <pre>
+          <code>
+            git merge {source}
+          </code>
+        </pre>
+        {t("scm-git-plugin.information.merge.resolve")}
+        <pre>
+          <code>
+            git add &lt;conflict file&gt;
+          </code>
+        </pre>
+        {t("scm-git-plugin.information.merge.commit")}
+        <pre>
+          <code>
+            git commit -m "Merge {source} into {target}"
+          </code>
+        </pre>
+      </div>
+    );
+  }
+}
+
+export default translate("plugins")(GitMergeInformation);

scm-plugins/scm-git-plugin/src/main/js/index.js

@@ -5,6 +5,7 @@ import GitAvatar from "./GitAvatar";
 
 import { ConfigurationBinder as cfgBinder } from "@scm-manager/ui-components";
 import GitGlobalConfiguration from "./GitGlobalConfiguration";
+import GitMergeInformation from "./GitMergeInformation";
 
 // repository
 
@@ -13,6 +14,7 @@ const gitPredicate = (props: Object) => {
 };
 
 binder.bind("repos.repository-details.information", ProtocolInformation, gitPredicate);
+binder.bind("repos.repository-merge.information", GitMergeInformation, gitPredicate);
 binder.bind("repos.repository-avatar", GitAvatar, gitPredicate);
 
 // global config

scm-plugins/scm-git-plugin/src/main/resources/locales/en/plugins.json

@@ -3,7 +3,17 @@
     "information": {
       "clone" : "Clone the repository",
       "create" : "Create a new repository",
-      "replace" : "Push an existing repository"
+      "replace" : "Push an existing repository",
+      "merge": {
+        "heading": "How to merge pull request",
+        "subheading": "Pull Request cannot be merged automatically - please follow these steps:",
+        "clean": "1. Make sure your workspace is clean",
+        "checkout": "2. Checkout target branch",
+        "update": "3. Update workspace",
+        "merge": "4. Merge source branch",
+        "resolve": "5. Resolve merge conflicts and add corrected files to index",
+        "commit": "6. Commit"
+      }
     },
     "config": {
       "link": "Git",