Improve no repos message on discover screen

next/src/main/kotlin/org/fdroid/ui/discover/Discover.kt

@@ -166,7 +166,13 @@ fun Discover(
                     }
                 }
                 NoEnabledReposDiscoverModel -> {
-                    Text(stringResource(R.string.no_repos_enabled))
+                    Text(
+                        text = stringResource(R.string.no_repos_enabled),
+                        textAlign = TextAlign.Center,
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .padding(horizontal = 16.dp, vertical = 64.dp)
+                    )
                 }
             }
             AnimatedVisibility(discoverModel is LoadedDiscoverModel) {
@@ -199,3 +205,20 @@ fun LoadingDiscoverPreview() {
         )
     }
 }
+
+@Preview
+@Composable
+private fun NoEnabledReposPreview() {
+    FDroidContent {
+        Discover(
+            discoverModel = NoEnabledReposDiscoverModel,
+            numUpdates = 0,
+            isBigScreen = false,
+            onListTap = {},
+            onAppTap = {},
+            onNav = {},
+            onSearch = {},
+            onSearchCleared = {},
+        )
+    }
+}

next/src/main/res/values/strings-next.xml

@@ -9,7 +9,7 @@
     <string name="menu_apps_my">My apps</string>
 
     <string name="first_start_loading">Retrieving apps…\n\nThis may take some time.</string>
-    <string name="no_repos_enabled">No repositories enabled.\nEnable at least one repository to see apps.</string>
+    <string name="no_repos_enabled">No repositories enabled.\nEnable or add at least one repository to see apps.</string>
     <string name="no_app_selected">No app selected</string>
     <string name="no_repository_selected">No repository selected</string>