Add more user-friendly network-related exception messages

app/src/main/java/eu/kanade/presentation/util/ExceptionFormatter.kt

@@ -4,16 +4,26 @@ import android.content.Context
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.network.HttpException
 import eu.kanade.tachiyomi.source.online.LicensedMangaChaptersException
+import eu.kanade.tachiyomi.util.system.isOnline
 import tachiyomi.data.source.NoResultsException
 import tachiyomi.domain.source.model.SourceNotInstalledException
+import java.net.UnknownHostException
 
 context(Context)
 val Throwable.formattedMessage: String
     get() {
         when (this) {
+            is HttpException -> return getString(R.string.exception_http, code)
+            is UnknownHostException -> {
+                return if (!isOnline()) {
+                    getString(R.string.exception_offline)
+                } else {
+                    getString(R.string.exception_unknown_host, message)
+                }
+            }
+
             is NoResultsException -> return getString(R.string.no_results_found)
             is SourceNotInstalledException -> return getString(R.string.loader_not_implemented_error)
-            is HttpException -> return "$message: ${getString(R.string.http_error_hint)}"
             is LicensedMangaChaptersException -> return getString(R.string.licensed_manga_chapters_error)
         }
         return when (val className = this::class.simpleName) {

i18n/src/main/res/values/strings.xml

@@ -606,8 +606,6 @@
     <!-- missing prompt after Compose rewrite #7901 -->
     <string name="no_more_results">No more results</string>
     <string name="no_results_found">No results found</string>
-    <!-- Do not translate "WebView" -->
-    <string name="http_error_hint">Check website in WebView</string>
     <string name="licensed_manga_chapters_error">Licensed - No chapters to show</string>
     <string name="local_source">Local source</string>
     <string name="other_source">Other</string>
@@ -947,4 +945,10 @@
     <string name="appwidget_updates_description">See your recently updated library entries</string>
     <string name="appwidget_unavailable_locked">Widget not available when app lock is enabled</string>
     <string name="remove_manga">You are about to remove \"%s\" from your library</string>
+
+    <!-- Common exceptions -->
+    <!-- Do not translate "WebView" -->
+    <string name="exception_http">HTTP %d, check website in WebView</string>
+    <string name="exception_offline">No Internet connection</string>
+    <string name="exception_unknown_host">Couldn\'t reach %s</string>
 </resources>