Python : Handle situations in which FASI is unable to access to a group chat;

SVG    : Add Xabber;
TOML   : Add Xabber and update several descriptions;
XHTML  : Update note for Haiku.

clients.toml

@@ -31,7 +31,7 @@ features = ["chat", "console", "desktop"]
 #and a few enhancements.
 #"""
 #apple = "https://beagle.im/#about"
-#features = ["chat", "desktop", "graphical"]
+#features = ["chat", "desktop", "graphical", "omemo"]
 
 [blabber]
 title = "blabber.im"
@@ -118,7 +118,7 @@ It is easy to use, reliable, battery friendly. With built-in support for \
 images, group chats and e2e encryption.
 """
 divestos = "https://f-droid.org/packages/eu.siacs.conversations"
-features = ["chat", "fdroid", "graphical", "mobile", "omemo", "openpgp"]
+features = ["chat", "fdroid", "graphical", "mobile", "omemo", "openpgp", "pwa"]
 
 [conversations-classic]
 title = "Conversations Classic"
@@ -194,8 +194,8 @@ home = "https://gajim.org"
 about = """
 Gajim aims to be an easy to use and fully-featured XMPP client.
 
-Chat securely with End-to-End encryption with your friends or family; easily \
-share pictures and thoughts; or discuss the news with your groups.
+Chat securely, using End-to-End encryption, with your friends or family; \
+easily share pictures and thoughts; or discuss the news with your groups.
 
 Gajim integrates well with your other devices: simply continue conversations \
 on your mobile device.
@@ -362,14 +362,14 @@ about = """
 Poezio is a free console XMPP client (the protocol on which the Jabber IM \
 network is built).
 
-Its purpose is to let you connect very easily (no account creation needed) to \
-the network and join various chatrooms, immediately. It tries to look like the \
-most famous IRC clients (weechat, irssi, etc). Many commands are identical and \
-you will not be lost if you already know these clients. Configuration can be \
-made in a configuration file or directly from the client.
+It allows you to connect very easily (no account creation needed) to the \
+XMPP network, and join to various of chatrooms, immediately.
 
-You will find the light, fast, geeky and anonymous spirit of IRC while using a \
-powerful, standard and open protocol.
+It mimics the appearance of the most famous IRC clients (weechat, irssi, etc), \
+and it includes many identical commands. You will be immediately familiar, if \
+you already know these clients. Configuration can be made in a configuration \
+file or directly from the client. You will find the light, fast, geeky and \
+anonymous spirit of IRC while using a powerful, standard and open protocol.
 """
 haiku = "https://depot.haiku-os.org/poezio"
 posix = "https://poez.io/en/#download"
@@ -409,7 +409,7 @@ supported operating system.
 apple = "https://psi-im.org"
 linux = "https://psi-im.org"
 reactos = "https://psi-im.org"
-features = ["adhoc", "admin", "chat", "desktop", "graphical", "openpgp", "otr"]
+features = ["adhoc", "admin", "chat", "desktop", "graphical", "omemo", "openpgp", "otr"]
 
 [psi-plus]
 title = "Psi+"
@@ -425,7 +425,7 @@ apple = "https://psi-plus.com/wiki/en:downloads#macos"
 haiku = "https://depot.haiku-os.org/psi_plus"
 linux = "https://psi-plus.com/wiki/en:downloads#linux"
 reactos = "https://psi-plus.com/wiki/en:downloads#ms_windows"
-features = ["adhoc", "admin", "chat", "desktop", "graphical", "haikudepot", "openpgp", "otr"]
+features = ["adhoc", "admin", "chat", "desktop", "graphical", "haikudepot", "omemo", "openpgp", "otr"]
 
 [reeder]
 title = "Reeder"
@@ -532,19 +532,19 @@ features = ["chat", "desktop", "graphical"]
 title = "UWPX"
 home = "https://uwpx.org"
 about = """
-UWPX is a app for your UWP (Windows 10 and Windows 11) devices. It implements \
-the Extensible Messaging and Presence Protocol (XMPP). At the moment UWPX is \
-in BETA stage so expect unexpected behavior sometimes.
+UWPX is a Windows app for your UWP (Windows 10 and Windows 11) devices.
 
-By default every connection between you and your server is encrypted via \
-TLS 1.2. This prevents attackers from reading your chat messages or metadata.
+At the moment, development on UWPX has stopped, and we are looking for a new \
+maintainer.
 
-OMEMO support is actively being worked on. Once implemented, OMEMO will \
-provide a multi-client end-to-end encryption so not even your own server can \
-read your chat messages.
+There is support for a wide range of features link bookmarks, user avatars, \
+chat markers and experimental OMEMO support.
+
+For a complete list of features, please refer to the project: \
+https://github.com/UWPX/UWPX-Client?tab=readme-ov-file#features
 """
 reactos = "https://uwpx.org"
-features = ["chat", "desktop", "graphical", "mobile"]
+features = ["chat", "desktop", "graphical", "mobile", "omemo"]
 
 [weechat]
 title = "WeeChat"
@@ -560,6 +560,21 @@ haiku = "https://depot.haiku-os.org/weechat"
 posix = "https://github.com/bqv/weechat-xmpp"
 features = ["chat", "console", "desktop", "omemo", "openpgp"]
 
+[xabber]
+title = "Xabber"
+home = "https://xabber.com"
+about = """
+Open source Jabber (XMPP) client with multi-account support, and a clean \
+interface to provide you with a first-class chat experience.
+
+Free (as in freedom!) and ad-free, Xabber looks and works great, and is built \
+to provide people with a simple, fast and secure messaging, based on \
+interoperable open standards.
+"""
+browser = "https://xabber.com"
+divestos = "https://xabber.com"
+features = ["chat", "desktop", "graphical", "omemo", "mobile"]
+
 #[xmpp-web]
 #title = "XMPP Web"
 #home = "https://github.com/nioc/xmpp-web"