[epiphany] gschema: Include the exact needed lang query parameters for search engines

[Marge Bot <marge-bot src gnome org>]

commit 18a48b41a9387035da285a456083b976c2176a01
Author: vanadiae <vanadiae35 gmail com>
Date:   Thu Jan 13 22:06:16 2022 +0100

    gschema: Include the exact needed lang query parameters for search engines
    
    This avoids having translators need to look for them, especially
    as oftentimes they don't even keep it in the URL, but instead store
    it e.g. as cookies.
    
    Fixes #1678
    
    Part-of: <https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1062>

 data/org.gnome.epiphany.gschema.xml | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/data/org.gnome.epiphany.gschema.xml b/data/org.gnome.epiphany.gschema.xml
index acd819cac..7fcac67b3 100644
--- a/data/org.gnome.epiphany.gschema.xml
+++ b/data/org.gnome.epiphany.gschema.xml
@@ -35,8 +35,12 @@
                </key>
                <key type="aa{sv}" name="search-engine-providers">
                        <!-- TRANSLATORS: These are the prepopulated search engines. You should
-                               add country-specific URL query parameters if appropriate (i.e. generally
-                               by adding &hl=your_language_code or by changing the domain name's TLD).
+                               add country-specific URL query parameters if appropriate or change
+                               the domain name's TLD. The different query parameters to be used for each
+                               engine is as follows:
+                               - DuckDuckGo: kl=country-language (see https://duckduckgo.com/params)
+                               - Google: hl=lang (see 
https://developers.google.com/custom-search/docs/xml_results_appendices#interfaceLanguages)
+                               - Bing: cc=country (see 
https://docs.microsoft.com/en-us/azure/cognitive-services/bing-web-search/language-support)
                                You are allowed to add search engines here, *if they make sense*. Please
                                don't add your favorite search engine just because you like it though,
                                only do it for search engines that are already widely used in this specific 
country.