Automatically retrieve description for new bookmarks

If the option is enabled, it will try to find a meta tag containing
the page description and keywords, just like we do for the page title.
It will either look for regular meta tag or OpenGraph ones.

The option is disabled by default.

Note that keywords meta tags is mostly not used.

In `configure` template, the variable associated with this setting
is `$retrieve_description`.

Fixes #1302

inc/languages/fr/LC_MESSAGES/shaarli.po

@@ -1,8 +1,8 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: Shaarli\n"
-"POT-Creation-Date: 2019-05-25 16:37+0200\n"
-"PO-Revision-Date: 2019-05-25 16:37+0200\n"
+"POT-Creation-Date: 2019-07-06 12:14+0200\n"
+"PO-Revision-Date: 2019-07-06 12:17+0200\n"
 "Last-Translator: \n"
 "Language-Team: Shaarli\n"
 "Language: fr_FR\n"
@@ -252,7 +252,7 @@ msgstr "404 Introuvable"
 msgid "Couldn't retrieve updater class methods."
 msgstr "Impossible de récupérer les méthodes de la classe Updater."
 
-#: application/updater/Updater.php:526 index.php:1033
+#: application/updater/Updater.php:526 index.php:1034
 msgid ""
 "You have enabled or changed thumbnails mode. <a href=\"?do=thumbs_update"
 "\">Please synchronize them</a>."
@@ -337,8 +337,8 @@ msgid "You are not supposed to change a password on an Open Shaarli."
 msgstr ""
 "Vous n'êtes pas censé modifier le mot de passe d'un Shaarli en mode ouvert."
 
-#: index.php:957 index.php:1007 index.php:1092 index.php:1122 index.php:1232
-#: index.php:1279
+#: index.php:957 index.php:1007 index.php:1094 index.php:1124 index.php:1234
+#: index.php:1281
 msgid "Wrong token."
 msgstr "Jeton invalide."
 
@@ -356,64 +356,64 @@ msgstr "Votre mot de passe a été modifié"
 msgid "Change password"
 msgstr "Modifier le mot de passe"
 
-#: index.php:1053
+#: index.php:1054
 msgid "Configuration was saved."
 msgstr "La configuration a été sauvegardée."
 
-#: index.php:1076 tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:24
+#: index.php:1078 tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:24
 msgid "Configure"
 msgstr "Configurer"
 
-#: index.php:1086 tmp/changetag.b91ef64efc3688266305ea9b42e5017e.rtpl.php:13
+#: index.php:1088 tmp/changetag.b91ef64efc3688266305ea9b42e5017e.rtpl.php:13
 #: tmp/tools.b91ef64efc3688266305ea9b42e5017e.rtpl.php:36
 msgid "Manage tags"
 msgstr "Gérer les tags"
 
-#: index.php:1105
+#: index.php:1107
 #, php-format
 msgid "The tag was removed from %d link."
 msgid_plural "The tag was removed from %d links."
 msgstr[0] "Le tag a été supprimé de %d lien."
 msgstr[1] "Le tag a été supprimé de %d liens."
 
-#: index.php:1106
+#: index.php:1108
 #, php-format
 msgid "The tag was renamed in %d link."
 msgid_plural "The tag was renamed in %d links."
 msgstr[0] "Le tag a été renommé dans %d lien."
 msgstr[1] "Le tag a été renommé dans %d liens."
 
-#: index.php:1113 tmp/addlink.b91ef64efc3688266305ea9b42e5017e.rtpl.php:13
+#: index.php:1115 tmp/addlink.b91ef64efc3688266305ea9b42e5017e.rtpl.php:13
 msgid "Shaare a new link"
 msgstr "Partager un nouveau lien"
 
-#: index.php:1342 tmp/linklist.b91ef64efc3688266305ea9b42e5017e.rtpl.php:169
+#: index.php:1344 tmp/linklist.b91ef64efc3688266305ea9b42e5017e.rtpl.php:169
 msgid "Edit"
 msgstr "Modifier"
 
-#: index.php:1342 index.php:1413
+#: index.php:1344 index.php:1416
 #: tmp/page.header.b91ef64efc3688266305ea9b42e5017e.rtpl.php:26
 #: tmp/page.header.cedf684561d925457130839629000a81.rtpl.php:26
 msgid "Shaare"
 msgstr "Shaare"
 
-#: index.php:1382
+#: index.php:1385
 msgid "Note: "
 msgstr "Note : "
 
-#: index.php:1421
+#: index.php:1424
 msgid "Invalid link ID provided"
 msgstr ""
 
-#: index.php:1441 tmp/export.b91ef64efc3688266305ea9b42e5017e.rtpl.php:65
+#: index.php:1444 tmp/export.b91ef64efc3688266305ea9b42e5017e.rtpl.php:65
 msgid "Export"
 msgstr "Exporter"
 
-#: index.php:1503 tmp/import.b91ef64efc3688266305ea9b42e5017e.rtpl.php:83
+#: index.php:1506 tmp/import.b91ef64efc3688266305ea9b42e5017e.rtpl.php:83
 msgid "Import"
 msgstr "Importer"
 
-#: index.php:1513
+#: index.php:1516
 #, php-format
 msgid ""
 "The file you are trying to upload is probably bigger than what this "
@@ -423,20 +423,20 @@ msgstr ""
 "le serveur web peut accepter (%s). Merci de l'envoyer en parties plus "
 "légères."
 
-#: index.php:1558 tmp/pluginsadmin.b91ef64efc3688266305ea9b42e5017e.rtpl.php:26
+#: index.php:1561 tmp/pluginsadmin.b91ef64efc3688266305ea9b42e5017e.rtpl.php:26
 #: tmp/tools.b91ef64efc3688266305ea9b42e5017e.rtpl.php:22
 msgid "Plugin administration"
 msgstr "Administration des plugins"
 
-#: index.php:1612 tmp/thumbnails.b91ef64efc3688266305ea9b42e5017e.rtpl.php:14
+#: index.php:1615 tmp/thumbnails.b91ef64efc3688266305ea9b42e5017e.rtpl.php:14
 msgid "Thumbnails update"
 msgstr "Mise à jour des miniatures"
 
-#: index.php:1778
+#: index.php:1781
 msgid "Search: "
 msgstr "Recherche : "
 
-#: index.php:1821
+#: index.php:1824
 #, php-format
 msgid ""
 "<pre>Sessions do not seem to work correctly on your server.<br>Make sure the "
@@ -455,7 +455,7 @@ msgstr ""
 "des cookies. Nous vous recommandons d'accéder à votre serveur depuis son "
 "adresse IP ou un <em>Fully Qualified Domain Name</em>.<br>"
 
-#: index.php:1831
+#: index.php:1834
 msgid "Click to try again."
 msgstr "Cliquer ici pour réessayer."
 
@@ -592,7 +592,7 @@ msgstr "Mauvaise réponse du hub %s"
 msgid "Enable PubSubHubbub feed publishing."
 msgstr "Active la publication de flux vers PubSubHubbub."
 
-#: plugins/qrcode/qrcode.php:73 plugins/wallabag/wallabag.php:68
+#: plugins/qrcode/qrcode.php:72 plugins/wallabag/wallabag.php:68
 msgid "For each link, add a QRCode icon."
 msgstr "Pour chaque lien, ajouter une icône de QRCode."
 
@@ -679,6 +679,34 @@ msgstr "Vous pouvez aussi modifier les tags dans la"
 msgid "tag list"
 msgstr "liste des tags"
 
+#: tmp/configure.90100d2eaf5d3705e14b9b4f78ecddc9.rtpl.php:143
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:312
+#: tmp/export.b91ef64efc3688266305ea9b42e5017e.rtpl.php:31
+msgid "All"
+msgstr "Tous"
+
+#: tmp/configure.90100d2eaf5d3705e14b9b4f78ecddc9.rtpl.php:147
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:316
+msgid "Only common media hosts"
+msgstr "Seulement les hébergeurs de média connus"
+
+#: tmp/configure.90100d2eaf5d3705e14b9b4f78ecddc9.rtpl.php:151
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:320
+msgid "None"
+msgstr "Aucune"
+
+#: tmp/configure.90100d2eaf5d3705e14b9b4f78ecddc9.rtpl.php:158
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:297
+msgid "You need to enable the extension <code>php-gd</code> to use thumbnails."
+msgstr ""
+"Vous devez activer l'extension <code>php-gd</code> pour utiliser les "
+"miniatures."
+
+#: tmp/configure.90100d2eaf5d3705e14b9b4f78ecddc9.rtpl.php:162
+#| msgid "Enable thumbnails"
+msgid "Synchonize thumbnails"
+msgstr ""
+
 #: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:29
 msgid "title"
 msgstr "titre"
@@ -762,50 +790,41 @@ msgid "Notify me when a new release is ready"
 msgstr "Me notifier lorsqu'une nouvelle version est disponible"
 
 #: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:247
+msgid "Automatically retrieve description for new bookmarks"
+msgstr "Récupérer automatiquement la description"
+
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:248
+msgid "Shaarli will try to retrieve the description from meta HTML headers"
+msgstr ""
+"Shaarli essaiera de récupérer la description depuis les balises HTML meta "
+"dans les entêtes"
+
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:263
 #: tmp/install.b91ef64efc3688266305ea9b42e5017e.rtpl.php:169
 msgid "Enable REST API"
 msgstr "Activer l'API REST"
 
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:248
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:264
 #: tmp/install.b91ef64efc3688266305ea9b42e5017e.rtpl.php:170
 msgid "Allow third party software to use Shaarli such as mobile application"
 msgstr ""
 "Permet aux applications tierces d'utiliser Shaarli, par exemple les "
 "applications mobiles"
 
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:263
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:279
 msgid "API secret"
 msgstr "Clé d'API secrète"
 
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:277
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:293
 msgid "Enable thumbnails"
 msgstr "Activer les miniatures"
 
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:281
-msgid "You need to enable the extension <code>php-gd</code> to use thumbnails."
-msgstr ""
-"Vous devez activer l'extension <code>php-gd</code> pour utiliser les "
-"miniatures."
-
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:285
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:301
 #: tmp/tools.b91ef64efc3688266305ea9b42e5017e.rtpl.php:56
 msgid "Synchronize thumbnails"
 msgstr "Synchroniser les miniatures"
 
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:296
-#: tmp/export.b91ef64efc3688266305ea9b42e5017e.rtpl.php:31
-msgid "All"
-msgstr "Tous"
-
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:300
-msgid "Only common media hosts"
-msgstr "Seulement les hébergeurs de média connus"
-
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:304
-msgid "None"
-msgstr "Aucune"
-
-#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:312
+#: tmp/configure.b91ef64efc3688266305ea9b42e5017e.rtpl.php:328
 #: tmp/editlink.b91ef64efc3688266305ea9b42e5017e.rtpl.php:72
 #: tmp/pluginsadmin.b91ef64efc3688266305ea9b42e5017e.rtpl.php:139
 #: tmp/pluginsadmin.b91ef64efc3688266305ea9b42e5017e.rtpl.php:199
@@ -1149,17 +1168,13 @@ msgstr "Déconnexion"
 
 #: tmp/page.header.b91ef64efc3688266305ea9b42e5017e.rtpl.php:150
 #: tmp/page.header.cedf684561d925457130839629000a81.rtpl.php:150
-#, fuzzy
-#| msgid "Public"
 msgid "Set public"
-msgstr "Publics"
+msgstr "Rendre public"
 
 #: tmp/page.header.b91ef64efc3688266305ea9b42e5017e.rtpl.php:155
 #: tmp/page.header.cedf684561d925457130839629000a81.rtpl.php:155
-#, fuzzy
-#| msgid "Private"
 msgid "Set private"
-msgstr "Privé"
+msgstr "Rendre privé"
 
 #: tmp/page.header.b91ef64efc3688266305ea9b42e5017e.rtpl.php:187
 #: tmp/page.header.cedf684561d925457130839629000a81.rtpl.php:187
@@ -1409,11 +1424,6 @@ msgstr ""
 "Glisser ce lien dans votre barre de favoris ou cliquer droit dessus et « "
 "Ajouter aux favoris »"
 
-#, fuzzy
-#~| msgid "Enable thumbnails"
-#~ msgid "Synchonize thumbnails"
-#~ msgstr "Activer les miniatures"
-
 #~ msgid ""
 #~ "You need to browse your Shaarli over <strong>HTTPS</strong> to use this "
 #~ "functionality."