Warn about unknown error instead of server error

app/src/main/java/org/pixeldroid/app/posts/feeds/CommonFeedFragmentUtils.kt

@@ -86,7 +86,7 @@ internal fun <T: Any> initAdapter(
                     Gson().fromJson(s, org.pixeldroid.app.utils.api.objects.Error::class.java)?.error?.ifBlank { null }
                 } catch (exception: Exception) {
                     errorLayout.root.context.getString(
-                        R.string.server_down_error,
+                        R.string.unknown_error,
                         it.error.localizedMessage.orEmpty()
                     )
                 }

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

@@ -123,7 +123,7 @@ For more info about Pixelfed, you can check here: https://pixelfed.org"</string>
     <!-- Loading error messages -->
     <string name="loading_toast">Something went wrong while loading</string>
     <string name="feed_failed">Could not get feed</string>
-    <string name="server_down_error">The server appears to be temporarily down: %1$s</string>
+    <string name="unknown_error">Unknown error, check if server is down: %1$s</string>
     <!-- Post pop-up options -->
     <string name="share_picture">Share picture…</string>
     <string name="save_to_gallery">Save to Gallery…</string>