aliciagh

Easily search through all blogs into your WordPress Multisite by post title, post content or post author. 
Multisite Global Search doesn’t work with single WordPress installation and it must be activated for all sites using “network activate” in the Administration Panel. 
Currently in the following languages:
<ul>
<li>Dutch (nl_NL) by Niels Boos <a href="http://www.webdienstenzzp.nl" rel="nofollow ugc">Webdiensten ZZP</a></li>
<li>English</li>
<li>German (de_DE) by Dennis Vorpahl</li>
<li>French (fr_FR) by Fabrice Perrinel</li>
<li>Italian (it_IT) by Davide Tommasin</li>
<li>Norwegian Bokmal (nb_NO) by Tore Johnny Bråtveit</li>
<li>Portuguese (pt_PT) by Jose Anjos</li>
<li>Russian (ru_RU) by Sam Savinov</li>
<li>Romanian (ro_RO) by Alexander Ovsov <a href="http://webhostinggeeks.com/science/" rel="nofollow ugc">Web Hosting Geek Science</a></li>
<li>Serbian (sr_RS) by Andrijana Nikolic [Web Hosting Geeks] http://science.webhostinggeeks.com/multisite-global-search</li>
<li>Slovak (sk_SK) by Branco <a href="http://webhostinggeeks.com/blog/" rel="nofollow ugc">Web Hosting Geeks</a></li>
<li>Spanish (es_ES)</li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext .po and .mo files</a> to me so that I can bundle it into Multisite Global Search.
** Features **
<ul>
<li>Multisite Global Search Widget. Show a search form in your sidebar.</li>
<li>Search across all network blogs or only in your blogs if you are logged.</li>
<li>Search on pages.</li>
<li>Administrative choice to perform searches by default on pages.</li>
<li>Administrative choice to disable search options.</li>
<li>Search results are showed in a page which contents the shortcode: <code>[multisite_search_result]</code></li>
<li>Show excerpted results <code>[multisite_search_result excerpt="yes"]</code></li>
<li>Entries on every site across your installation appear in search results immediately after publication.</li>
<li>Receive results from your complete blog network, even sites you do not own or control.</li>
<li>Customizable style sheet for widget and results page.</li>
<li>Two different form types, vertical and horizontal.</li>
<li>Put search form into your code with <code>Multisite_Global_Search::ms_global_search_vertical_form(your_results_page)</code> or <code>Multisite_Global_Search::ms_global_search_horizontal_form(your_results_page)</code></li>
<li>Insert search form in templates using the shortcode: <code>[multisite_search_form]</code>. <a href="http://grial.usal.es/agora/pfcgrial/multisite-search" rel="nofollow ugc">See the plugin page for more information</a>.</li>
</ul>
Last version contributed by <a href="https://github.com/lachele" rel="nofollow ugc">Lachele Foley</a>
<h3>Customization</h3>
You may make a few customizations to how the plugin looks and behaves. To make these customizations, you will need to be able to write to the multisite-global-search directory.
Adding Behavior Customizations
<ol>
<li>Make a file in the multisite-global-search directory called “config_local.php”.</li>
<li>See the file called “config.php” for the list of items you may customize. The file contains documentation for each of them.</li>
<li>Copy the lines containing variables you wish to change to config_local.php and alter them as desired. Take care to retain formatting, for example, the line-ending semicolon.</li>
<li>Make a backup copy of your config_local.php that is stored outside your WordPress installation!</li>
</ol>
Adding Look and Feel Customizations
<ol>
<li>Make a file in the multisite-global-search directory called “customstyle.css”.</li>
<li>Add your style alterations to this file. It will be loaded after the default style.css.</li>
<li>Make a backup copy of your customstyle.css that is stored outside your WordPress installation!</li>
</ol>

Multisite Global Search

Adds the ability to search through blogs into your WordPress Multisite installation.

lucatume

Dennis Ploetner

A simple, powerful, and user-friendly plugin that adds multilingual support to your <a href="https://wordpress.org/documentation/article/create-a-network/" rel="ugc">WordPress multisite</a> installation, whether using multiple subdomains or folders. Multisite Language Switcher allows you to effortlessly manage translations for posts, pages, custom post types, categories, tags, and custom taxonomies.
The plugin uses flag icons from <a href="http://famfamfam.com" rel="nofollow ugc">FamFamFam</a>. Thanks to Mark James for his great work. In addition, I would like to thank <a href="https://creativpin.com" rel="nofollow ugc">Jürgen Mayer</a> for creating the plugin’s banner.
Please, don’t forget to <a href="https://wordpress.org/support/plugin/multisite-language-switcher/reviews/" rel="ugc">rate this plugin</a>! 🙂
<h3>Translators</h3>
Thanks to all the translators for their great work.
<ul>
<li>German (de_DE) – <a href="http://lloc.de/" rel="nofollow ugc">Dennis Ploetner</a></li>
<li>Italian (it_IT) – <a href="http://www.freely.de/it/" rel="nofollow ugc">Antonella Cucinelli</a></li>
<li>Dutch (nl_NL) – <a href="http://www.buurtaal.de/" rel="nofollow ugc">Alexandra Kleijn</a></li>
<li>Brazillian Portuguese (pt_BR) – <a href="http://www.coolweb.com.br/" rel="nofollow ugc">Coolweb</a></li>
<li>Spanish (es_ES) – <a href="http://www.ab-weblog.com/en/" rel="nofollow ugc">Andreas Breitschopp</a></li>
<li>French (fr_FR) – <a href="http://www.ab-tools.com/en/" rel="nofollow ugc">Andreas Breitschopp</a></li>
<li>Russian (ru_RU) – <a href="http://j4vk.com/" rel="nofollow ugc">Andrey Vystavkin</a></li>
<li>Ukrainian (uk) – <a href="http://worm.org.ua/" rel="nofollow ugc">Victor Melnichenko</a></li>
<li>Croatian (hr_HR) – <a href="https://github.com/Brankec69" rel="nofollow ugc">Brankec69</a></li>
<li>Romanian (ro_RO) – <a href="http://caveatlector.eu/" rel="nofollow ugc">Armand K</a></li>
<li>Polish (pl_PL) – <a href="http://www.mojito-networks.com/" rel="nofollow ugc">Kamil Frejlich</a></li>
<li>Lithuanian (lt_LT) – Ovidijus Pukys</li>
<li>Catalan (ca_ES) – Joan López</li>
<li>Czech (cs_CZ) – Rastr</li>
<li>Hungarian (hu_HU) – RobiG</li>
<li>Georgian (ka_GE) – <a href="http://www.gwebpro.com/" rel="nofollow ugc">Jas Saran</a></li>
<li>Greek (el) – <a href="http://www.aivazidis.org/" rel="nofollow ugc">Christoforos Aivazidis</a></li>
<li>Serbian (sr_RS) – <a href="http://www.webhostinghub.com/" rel="nofollow ugc">Web Hosting Hub</a></li>
<li>Turkish (tr) – Alican Cakil</li>
<li>Armenian (hy_AM) – Yeghishe Nersisyan</li>
<li>Bengali (bn_BD) – Md. Nazmul Huda</li>
<li>Japanese (ja) – <a href="http://themeboy.com/" rel="nofollow ugc">ThemeBoy</a></li>
<li>Swedish (sv_SE) – <a href="http://www.bernskioldmedia.com/" rel="nofollow ugc">Erik Bernskiold</a></li>
<li>Traditional & Simplified Chinese (zh_CN & zh_TW) – DrBenson</li>
<li>Arabic (ar) – Mohamed Elwan</li>
<li>Norwegian (nb_NO) – Ibrahim Qraiqe</li>
<li>Bulgarian (bg_BG) – <a href="http://www.catblue.net/" rel="nofollow ugc">Vencislav Raev</a></li>
<li>Mexican Spanish (es_MX) – <a href="https://fernandomata.mx/" rel="nofollow ugc">Fernando Mata</a></li>
</ul>
You can translate this plugin on <a href="https://translate.wordpress.org/projects/wp-plugins/multisite-language-switcher/" rel="nofollow ugc">translate.wordpress.org</a>, or if you prefer and have created your language pack, or have an update of an existing one, you can <a href="mailto:re@lloc.de" rel="nofollow ugc">send me</a> your Gettext PO and MO so that I can 
bundle it into the Multisite Language Switcher. You can download the latest POT file 
<a href="https://plugins.svn.wordpress.org/multisite-language-switcher/trunk/languages/default.pot" rel="nofollow ugc">from here</a>.

Multisite Language Switcher

Do I have to add anything else?

Made my life (a lot) easier!

It does exactly what it should

I have been using this plugin in combination with MslsMenu for more than 7 years now. 

For me this is a simple, yet absolutely perfect solution for any multilingual WordPress site. Very easy to use. Easily linking cross-blog pages together without having to worry about any third-party plugin compatibility. 

Its simplicity allows website admins full control over the content of each individual blog. Perfect if not all your blogs offer the exact same content, like country-restricted services such as gift cards or house calls or payment methods.

WordPress MultiSite handles all settings per blog and with MultiSite Language Switcher you can use different date/time formatting, even different email addresses, etc. tailored to the blog's locale. 

Thank you very much for providing the perfect solution, Dennis!

The prefect, simple solution!

A simple, powerful and easy-to-use plugin that will help you to manage multilingual content in a multisite WordPress installation.

Multisite Global Search vs Multisite Language Switcher