diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/client/ClientsFragment.kt b/mobile/src/main/java/be/mygod/vpnhotspot/client/ClientsFragment.kt
index 914fab11..db48cb38 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/client/ClientsFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/client/ClientsFragment.kt
@@ -37,7 +37,7 @@ import be.mygod.vpnhotspot.net.monitor.TrafficRecorder
 import be.mygod.vpnhotspot.room.AppDatabase
 import be.mygod.vpnhotspot.room.ClientStats
 import be.mygod.vpnhotspot.room.TrafficRecord
-import be.mygod.vpnhotspot.util.SpanFormatter
+import be.mygod.vpnhotspot.util.format
 import be.mygod.vpnhotspot.util.showAllowingStateLoss
 import be.mygod.vpnhotspot.util.toPluralInt
 import be.mygod.vpnhotspot.widget.SmartSnackbar
@@ -82,10 +82,11 @@ class ClientsFragment : Fragment() {
     data class StatsArg(val title: CharSequence, val stats: ClientStats) : Parcelable
     class StatsDialogFragment : AlertDialogFragment<StatsArg, Empty>() {
         override fun AlertDialog.Builder.prepare(listener: DialogInterface.OnClickListener) {
-            setTitle(SpanFormatter.format(getText(R.string.clients_stats_title), arg.title))
             val context = context
             val resources = resources
-            val format = NumberFormat.getIntegerInstance(resources.configuration.locale)
+            val locale = resources.configuration.locale
+            setTitle(getText(R.string.clients_stats_title).format(locale, arg.title))
+            val format = NumberFormat.getIntegerInstance(locale)
             setMessage("%s\n%s\n%s".format(
                     resources.getQuantityString(R.plurals.clients_stats_message_1, arg.stats.count.toPluralInt(),
                             format.format(arg.stats.count), DateUtils.formatDateTime(context, arg.stats.timestamp,
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt b/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
index a5b2056a..bc6e7fec 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
@@ -13,8 +13,8 @@ import androidx.preference.Preference
 import be.mygod.vpnhotspot.R
 import be.mygod.vpnhotspot.net.monitor.FallbackUpstreamMonitor
 import be.mygod.vpnhotspot.net.monitor.UpstreamMonitor
-import be.mygod.vpnhotspot.util.SpanFormatter
 import be.mygod.vpnhotspot.util.allRoutes
+import be.mygod.vpnhotspot.util.format
 import be.mygod.vpnhotspot.util.parseNumericAddress
 import timber.log.Timber
 
@@ -72,7 +72,7 @@ class UpstreamsPreference(context: Context, attrs: AttributeSet) : Preference(co
     }
 
     private fun onUpdate() = (context as LifecycleOwner).lifecycleScope.launchWhenStarted {
-        summary = SpanFormatter.format(context.getText(R.string.settings_service_upstream_monitor_summary),
-                primary.charSequence, fallback.charSequence)
+        summary = context.getText(R.string.settings_service_upstream_monitor_summary).format(
+            context.resources.configuration.locale, primary.charSequence, fallback.charSequence)
     }
 }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/util/SpanFormatter.kt b/mobile/src/main/java/be/mygod/vpnhotspot/util/SpanFormatter.kt
deleted file mode 100644
index e3d056fe..00000000
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/SpanFormatter.kt
+++ /dev/null
@@ -1,84 +0,0 @@
-package be.mygod.vpnhotspot.util
-
-import android.text.Spannable
-import android.text.SpannableStringBuilder
-import android.text.Spanned
-import android.text.SpannedString
-import java.util.*
-
-/**
- * Provides [String.format] style functions that work with [Spanned] strings and preserve formatting.
- *
- * https://github.com/george-steel/android-utils/blob/289aff11e53593a55d780f9f5986e49343a79e55/src/org/oshkimaadziig/george/androidutils/SpanFormatter.java
- *
- * @author George T. Steel
- */
-object SpanFormatter {
-    private val formatSequence = "%([0-9]+\\$|<?)([^a-zA-z%]*)([[a-zA-Z%]&&[^tT]]|[tT][a-zA-Z])".toPattern()
-
-    /**
-     * Version of [String.format] that works on [Spanned] strings to preserve rich text formatting.
-     * Both the `format` as well as any `%s args` can be Spanned and will have their formatting preserved.
-     * Due to the way [Spannable]s work, any argument's spans will can only be included **once** in the result.
-     * Any duplicates will appear as text only.
-     *
-     * @param format the format string (see [java.util.Formatter.format])
-     * @param args
-     * the list of arguments passed to the formatter. If there are
-     * more arguments than required by `format`,
-     * additional arguments are ignored.
-     * @return the formatted string (with spans).
-     */
-    fun format(format: CharSequence, vararg args: Any) = format(Locale.getDefault(), format, *args)
-
-    /**
-     * Version of [String.format] that works on [Spanned] strings to preserve rich text formatting.
-     * Both the `format` as well as any `%s args` can be Spanned and will have their formatting preserved.
-     * Due to the way [Spannable]s work, any argument's spans will can only be included **once** in the result.
-     * Any duplicates will appear as text only.
-     *
-     * @param locale
-     * the locale to apply; `null` value means no localization.
-     * @param format the format string (see [java.util.Formatter.format])
-     * @param args
-     * the list of arguments passed to the formatter.
-     * @return the formatted string (with spans).
-     * @see String.format
-     */
-    fun format(locale: Locale, format: CharSequence, vararg args: Any): SpannedString {
-        val out = SpannableStringBuilder(format)
-
-        var i = 0
-        var argAt = -1
-
-        while (i < out.length) {
-            val m = formatSequence.matcher(out)
-            if (!m.find(i)) break
-            i = m.start()
-            val exprEnd = m.end()
-
-            val argTerm = m.group(1)!!
-            val modTerm = m.group(2)
-
-            val cookedArg = when (val typeTerm = m.group(3)) {
-                "%" -> "%"
-                "n" -> "\n"
-                else -> {
-                    val argItem = args[when (argTerm) {
-                        "" -> ++argAt
-                        "<" -> argAt
-                        else -> Integer.parseInt(argTerm.substring(0, argTerm.length - 1)) - 1
-                    }]
-                    if (typeTerm == "s" && argItem is Spanned) argItem else {
-                        String.format(locale, "%$modTerm$typeTerm", argItem)
-                    }
-                }
-            }
-
-            out.replace(i, exprEnd, cookedArg)
-            i += cookedArg.length
-        }
-
-        return SpannedString(out)
-    }
-}
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
index 2b024db6..998b464e 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
@@ -12,9 +12,7 @@ import android.os.RemoteException
 import android.system.ErrnoException
 import android.system.Os
 import android.system.OsConstants
-import android.text.Spannable
-import android.text.SpannableString
-import android.text.SpannableStringBuilder
+import android.text.*
 import android.view.MenuItem
 import android.view.View
 import android.widget.ImageView
@@ -39,6 +37,7 @@ import java.lang.reflect.Method
 import java.net.InetAddress
 import java.net.NetworkInterface
 import java.net.SocketException
+import java.util.*
 
 tailrec fun Throwable.getRootCause(): Throwable {
     if (this is InvocationTargetException || this is RemoteException) return (cause ?: return this).getRootCause()
@@ -80,6 +79,53 @@ fun setVisibility(view: View, value: Boolean) {
     view.isVisible = value
 }
 
+private val formatSequence = "%([0-9]+\\$|<?)([^a-zA-z%]*)([[a-zA-Z%]&&[^tT]]|[tT][a-zA-Z])".toPattern()
+/**
+ * Version of [String.format] that works on [Spanned] strings to preserve rich text formatting.
+ * Both the `format` as well as any `%s args` can be Spanned and will have their formatting preserved.
+ * Due to the way [Spannable]s work, any argument's spans will can only be included **once** in the result.
+ * Any duplicates will appear as text only.
+ *
+ * See also: https://github.com/george-steel/android-utils/blob/289aff11e53593a55d780f9f5986e49343a79e55/src/org/oshkimaadziig/george/androidutils/SpanFormatter.java
+ *
+ * @param locale
+ * the locale to apply; `null` value means no localization.
+ * @param format the format string (see [java.util.Formatter.format])
+ * @param args
+ * the list of arguments passed to the formatter.
+ * @return the formatted string (with spans).
+ * @see String.format
+ * @author George T. Steel
+ */
+fun CharSequence.format(locale: Locale, vararg args: Any) = SpannableStringBuilder(this).apply {
+    var i = 0
+    var argAt = -1
+    while (i < length) {
+        val m = formatSequence.matcher(this)
+        if (!m.find(i)) break
+        i = m.start()
+        val exprEnd = m.end()
+        val argTerm = m.group(1)!!
+        val modTerm = m.group(2)
+        val cookedArg = when (val typeTerm = m.group(3)) {
+            "%" -> "%"
+            "n" -> "\n"
+            else -> {
+                val argItem = args[when (argTerm) {
+                    "" -> ++argAt
+                    "<" -> argAt
+                    else -> Integer.parseInt(argTerm.substring(0, argTerm.length - 1)) - 1
+                }]
+                if (typeTerm == "s" && argItem is Spanned) argItem else {
+                    String.format(locale, "%$modTerm$typeTerm", argItem)
+                }
+            }
+        }
+        replace(i, exprEnd, cookedArg)
+        i += cookedArg.length
+    }
+}
+
 fun makeIpSpan(ip: InetAddress) = ip.hostAddress.let {
     // exclude all bogon IP addresses supported by Android APIs
     if (!app.hasTouch || ip.isMulticastAddress || ip.isAnyLocalAddress || ip.isLoopbackAddress ||