RPM Registry: Show zypper commands for SUSE based distros as well (#25981) (#26020)

Backport #25981 by @asdil12

After RPM is supported with https://github.com/go-gitea/gitea/pull/23380
let's show the user
how to add the repo and install the RPM via all common package managers.

Co-authored-by: Dominik Heidler <dominik@heidler.eu>

docs/content/doc/usage/packages/overview.en-us.md

 | [NuGet]({{< relref "doc/usage/packages/nuget.en-us.md" >}}) | .NET | `nuget` |
 | [Pub]({{< relref "doc/usage/packages/pub.en-us.md" >}}) | Dart | `dart`, `flutter` |
 | [PyPI]({{< relref "doc/usage/packages/pypi.en-us.md" >}}) | Python | `pip`, `twine` |
-| [RPM]({{< relref "doc/usage/packages/rpm.en-us.md" >}}) | - | `yum`, `dnf` |
+| [RPM]({{< relref "doc/usage/packages/rpm.en-us.md" >}}) | - | `yum`, `dnf`, `zypper` |
 | [RubyGems]({{< relref "doc/usage/packages/rubygems.en-us.md" >}}) | Ruby | `gem`, `Bundler` |
 | [Swift]({{< relref "doc/usage/packages/rubygems.en-us.md" >}}) | Swift | `swift` |
 | [Vagrant]({{< relref "doc/usage/packages/vagrant.en-us.md" >}}) | - | `vagrant` |

docs/content/doc/usage/packages/overview.zh-cn.md

 | [NuGet]({{< relref "doc/usage/packages/nuget.zh-cn.md" >}})         | .NET       | `nuget`                   |
 | [Pub]({{< relref "doc/usage/packages/pub.zh-cn.md" >}})             | Dart       | `dart`, `flutter`         |
 | [PyPI]({{< relref "doc/usage/packages/pypi.zh-cn.md" >}})           | Python     | `pip`, `twine`            |
-| [RPM]({{< relref "doc/usage/packages/rpm.zh-cn.md" >}})             | -          | `yum`, `dnf`              |
+| [RPM]({{< relref "doc/usage/packages/rpm.zh-cn.md" >}})             | -          | `yum`, `dnf`, `zypper`    |
 | [RubyGems]({{< relref "doc/usage/packages/rubygems.zh-cn.md" >}})   | Ruby       | `gem`, `Bundler`          |
 | [Swift]({{< relref "doc/usage/packages/rubygems.zh-cn.md" >}})      | Swift      | `swift`                   |
 | [Vagrant]({{< relref "doc/usage/packages/vagrant.zh-cn.md" >}})     | -          | `vagrant`                 |

docs/content/doc/usage/packages/rpm.en-us.md

 
 ## Requirements
 
-To work with the RPM registry, you need to use a package manager like `yum` or `dnf` to consume packages.
+To work with the RPM registry, you need to use a package manager like `yum`, `dnf` or `zypper` to consume packages.
 
 The following examples use `dnf`.
 
 
 ## Delete a package
 
-To delete a Debian package perform a HTTP DELETE operation. This will delete the package version too if there is no file left.
+To delete an RPM package perform a HTTP DELETE operation. This will delete the package version too if there is no file left.
 
 ```
 DELETE https://gitea.example.com/api/packages/{owner}/rpm/{package_name}/{package_version}/{architecture}

docs/content/doc/usage/packages/rpm.zh-cn.md

 
 ## 要求
 
-要使用RPM注册表，您需要使用像 `yum` 或 `dnf` 这样的软件包管理器来消费软件包。
+要使用RPM注册表，您需要使用像 `yum`, `dnf` 或 `zypper` 这样的软件包管理器来消费软件包。
 
 以下示例使用 `dnf`。
 

options/locale/locale_en-US.ini

 pypi.install = To install the package using pip, run the following command:
 pypi.documentation = For more information on the PyPI registry, see <a target="_blank" rel="noopener noreferrer" href="%s">the documentation</a>.
 rpm.registry = Setup this registry from the command line:
+rpm.distros.redhat = on RedHat based distributions
+rpm.distros.suse = on SUSE based distributions
 rpm.install = To install the package, run the following command:
 rpm.documentation = For more information on the RPM registry, see <a target="_blank" rel="noopener noreferrer" href="%s">the documentation</a>.
 rubygems.install = To install the package using gem, run the following command:

templates/package/content/rpm.tmpl

 		<div class="ui form">
 			<div class="field">
 				<label>{{svg "octicon-terminal"}} {{.locale.Tr "packages.rpm.registry"}}</label>
-				<div class="markup"><pre class="code-block"><code>dnf config-manager --add-repo <gitea-origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/rpm.repo"></gitea-origin-url></code></pre></div>
+				<div class="markup"><pre class="code-block"><code># {{.locale.Tr "packages.rpm.distro.redhat"}}
+dnf config-manager --add-repo <gitea-origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/rpm.repo"></gitea-origin-url>
+
+# {{.locale.Tr "packages.rpm.distro.suse"}}
+zypper addrepo <gitea-origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/rpm.repo"></gitea-origin-url></code></pre></div>
 			</div>
 			<div class="field">
 				<label>{{svg "octicon-terminal"}} {{.locale.Tr "packages.rpm.install"}}</label>
 				<div class="markup">
-					<pre class="code-block"><code>dnf install {{$.PackageDescriptor.Package.Name}}</code></pre>
+					<pre class="code-block"><code># {{.locale.Tr "packages.rpm.distro.redhat"}}
+dnf install {{$.PackageDescriptor.Package.Name}}
+
+# {{.locale.Tr "packages.rpm.distro.suse"}}
+zypper install {{$.PackageDescriptor.Package.Name}}</code></pre>
 				</div>
 			</div>
 			<div class="field">