moved hard-coded string to resources. Translated app to French.

app/src/main/java/fr/forum_thalie/tsumugi/Values.kt

 import kotlin.collections.ArrayList
 
 const val tag = "fr.forum_thalie.tsumugi"
-const val noConnectionValue = "Arrêté."
-const val streamDownValue = "Tsumugi est HS !"
+const val noConnectionValue = "—"
+const val streamDownValue = "Tsumugi est HS !" // we don't want this value to be displaed in the "last played" screen.
 val weekdaysArray : Array<String> = arrayOf( "Lundi", "Mardi", "Mercredi", "Jeudi", "Vendredi", "Samedi", "Dimanche")
 
+// Below this line is only automatically programmed values. Unless your week does not start with Monday, you don't need to change this.
+
 val weekdays = ArrayList<String>().apply { weekdaysArray.forEach { add(it) } }
 val weekdaysSundayFirst = ArrayList<String>().apply {
     weekdays.forEach {

app/src/main/java/fr/forum_thalie/tsumugi/planning/Planning.kt

 import androidx.lifecycle.MutableLiveData
 import fr.forum_thalie.tsumugi.Async
 import fr.forum_thalie.tsumugi.R
+import fr.forum_thalie.tsumugi.noConnectionValue
 import fr.forum_thalie.tsumugi.weekdays
 import org.json.JSONObject
 import java.io.IOException
             if (it.isCurrent())
                 return it.title
         }
-        return regularProgramme ?: "—"
+        return regularProgramme ?: noConnectionValue
     }
 
     fun checkProgramme()

app/src/main/java/fr/forum_thalie/tsumugi/ui/nowplaying/NowPlayingFragment.kt

             if (sleepAtMillis != null)
             {
                 val duration = ((sleepAtMillis - System.currentTimeMillis()).toFloat() / (60f * 1000f) + 1).toInt() // I put 1 + it because the division rounds to the lower integer. I'd like to display the round up, like it's usually done.
-                sleepInfoText.text = "Will close in $duration minute${if (duration > 1) "s" else ""}"
+                sleepInfoText.text = String.format(getString(R.string.willCloseIn), duration) // "Will close in $duration minute${if (duration > 1) "s" else ""}"
                 sleepInfoText.visibility = View.VISIBLE
             } else {
                 sleepInfoText.visibility = View.GONE

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

+<resources>
+    <string name="app_name">Tsumugi</string>
+    <string name="title_nowplaying">Tsumugi</string>
+    <string name="title_queue_lp">Titres</string>
+    <string name="title_chat">Chat</string>
+    <string name="title_news">Actus</string>
+    <string name="title_programme">Planning</string>
+
+    <string name="now_playing_notification_title_template">Maintenant: %1$s</string>
+
+    <string name="MEDIA_ROOT_ID">radio_root_id</string>
+    <string name="STREAM_URL_RADIO">https://relay0.r-a-d.io/main.mp3</string>
+    <string name="STREAM_URL_TSUMUGI">https://radio.mahoro-net.org/streams/tsumugi</string>
+    <string name="STREAM_URL_RSTLSS">http://stream.radiosolution.fr/rstlss.mp3</string>
+
+    <string name="volume">Volume : </string>
+
+    <string name="up_next">Émission en cours :</string>
+    <string name="now_streaming">En cours</string>
+    <string name="error_webView">Erreur du chargement de WebView. Téléchargez Google Chrome sur le Play Store, ou activez le si vous l\'avez désactivé.</string>
+    <string name="action_settings">Paramètres</string>
+    <string name="action_bug_submit">Reporter un bug (GitHub)</string>
+    <string name="github_url_new_issue">https://github.com/yattoz/Tsumugi-app/issues/</string>
+
+    <string name="nowPlayingNotificationChannel">Tsumugi Stream Service</string>
+    <string name="nowPlayingChannelId">fr.forum_thalie.tsumugi.PLAYER_SERVICE</string>
+
+    <string name="snackbarPersistent">Restent visibles, peuvent être fermées avec un bouton \"OK\" ou en glissant.</string>
+    <string name="snackbarNonPersistent">Disparaissent après quelques instants</string>
+    <string name="every_day">Tous les jours</string>
+    <string name="working_days">Semaine ouvrée</string>
+    <string name="song_to_clipboard">Titre copié dans le presse-papier !</string>
+    <string name="listeners">Auditeurs</string>
+    <string name="r_a_dio_icon">Icone de la radio</string>
+    <string name="split_layout">Divise l\'écran en 2 parties quand l\'appareil est à l\'horizontale</string>
+    <string name="not_split_layout">Garde la même disposition à l\'horizontale et à la verticale</string>
+    <string name="action_sleep">Minuterie avant fermeture</string>
+    <string name="dont_fetch_on_background">Désactiver</string>
+    <string name="restart_the_app">Vous devez redémarrer l\'application pour valider ces changements.</string>
+
+    <string name="action_alarm">Alarme</string>
+    <string name="sleep_fade_out_text">Une minute avant la fin de la minuterie, le volume va décroitre progressivement.</string>
+    <string name="disable">Désactiver</string>
+    <string name="website_url">https://tsumugi.forum-thalie.fr/</string>
+    <string name="rss_url">https://tsumugi.forum-thalie.fr/?feed=rss2</string>
+    <string name="planning_url">ADD SOME URL HERE</string>
+    <string name="select_one_day">Sélectionner au moins un jour.</string>
+    <string name="no_alarm_set">Pas d\'alarme</string>
+    <string name="next_alarm">Prochaine alarme :</string>
+    <string name="lp">Dernières titres</string>
+    <string name="programme">Planning</string>
+    <string name="regular_programme">Programme régulier</string>
+    <string name="useAlarmClock">Activer l\alarme</string>
+    <string name="setTime">Choisir l\'heure</string>
+    <string name="selectDaysOfWeek">Choisir les jours</string>
+    <string name="SetSnoozeDuration">Choisir le délai de snooze (minutes)</string>
+    <string name="volumeAtStartup">Volume au démarrage</string>
+    <string name="useHorizontalSplitLayout">Utiliser une disposition horizontale adaptée</string>
+    <string name="makeSnackbarsPersistent">Rendre les barres d\information persistantes</string>
+    <string name="setupAlarmClock">Configurer l\'alarme</string>
+    <string name="setSleepTimer">Configurer la minuterie avant extinction</string>
+    <string name="costumizeAppBehavior">Paramètres de l\'application</string>
+    <string name="submitABug">Reporter un bug</string>
+    <string name="sleepClosesApp">Minuterie avant fermeture de l\'application</string>
+    <string name="setSleepDuration">Choisir une durée (en minutes)</string>
+    <string name="willCloseIn">Extinction dans %1$d minutes</string>
+
+</resources>

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

-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools" tools:ignore="MissingTranslation">
     <string name="app_name">Tsumugi</string>
     <string name="title_nowplaying">Tsumugi</string>
     <string name="title_queue_lp">Songs</string>
     <string name="lp">Last played</string>
     <string name="programme">Planning</string>
     <string name="regular_programme">Programme régulier</string>
+    <string name="useAlarmClock">Use as alarm clock</string>
+    <string name="setTime">Set time</string>
+    <string name="selectDaysOfWeek">Select days of the week</string>
+    <string name="SetSnoozeDuration">Set snooze duration (minutes)</string>
+    <string name="volumeAtStartup">Volume at startup</string>
+    <string name="useHorizontalSplitLayout">Use horizontal split layout</string>
+    <string name="makeSnackbarsPersistent">Make Snackbars persistent</string>
+    <string name="setupAlarmClock">Set up alarm clock</string>
+    <string name="setSleepTimer">Set sleep timer</string>
+    <string name="costumizeAppBehavior">Customize app behavior</string>
+    <string name="submitABug">Submit a bug (opens GitHub in a web browser)</string>
+    <string name="sleepClosesApp">Sleep - close app after some time</string>
+    <string name="setSleepDuration">Set duration (minutes)</string>
+    <string name="willCloseIn">Will close in %1$d minutes</string>
 
 </resources>

app/src/main/res/xml/alarm_preferences.xml

     <SwitchPreferenceCompat
         app:key="isWakingUp"
         app:iconSpaceReserved="false"
-        app:title="Use as alarm clock"
+        app:title="@string/useAlarmClock"
         app:singleLineTitle="false"
         app:defaultValue="false"
         />
     <Preference
         app:key="timeSet"
         app:iconSpaceReserved="false"
-        app:title="Set time"
+        app:title="@string/setTime"
         app:singleLineTitle="false"
         app:defaultValue="false"/>
 
     <MultiSelectListPreference
         app:key="alarmDays"
         app:iconSpaceReserved="false"
-        app:title="Select days of the week"
+        app:title="@string/selectDaysOfWeek"
         app:singleLineTitle="false"
 
         />
     <ListPreference
         app:key="snoozeDuration"
         app:iconSpaceReserved="false"
-        android:title="Set snooze duration (minutes)"
+        android:title="@string/SetSnoozeDuration"
         app:singleLineTitle="false"
         android:entries="@array/snoozeValues"
         android:entryValues="@array/snoozeValues"

app/src/main/res/xml/customize_preferences.xml

     <SeekBarPreference
         app:key="volume"
         app:iconSpaceReserved="false"
-        app:title="Volume at startup"
+        app:title="@string/volumeAtStartup"
         app:singleLineTitle="false"
         app:min="0"
         android:max="100"
     <SwitchPreferenceCompat
         app:key="splitLayout"
         app:iconSpaceReserved="false"
-        app:title="Use horizontal split layout"
+        app:title="@string/useHorizontalSplitLayout"
         app:singleLineTitle="false"
         app:defaultValue="true"
         />
     <SwitchPreferenceCompat
         app:key="snackbarPersistent"
         app:iconSpaceReserved="false"
-        app:title="Make Snackbars persistent"
+        app:title="@string/makeSnackbarsPersistent"
         app:singleLineTitle="false"
         app:defaultValue="false"
         />

app/src/main/res/xml/preferences.xml

 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen
-    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     >
 
     <Preference
         app:icon="@drawable/ic_alarm"
         app:key="alarmScreen"
-        app:title="Set up alarm clock"
+        app:title="@string/setupAlarmClock"
         app:fragment="fr.forum_thalie.tsumugi.preferences.AlarmFragment"
         />
 
     <Preference
         app:icon="@drawable/ic_av_timer"
         app:key="sleepScreen"
-        app:title="Set sleep timer"
+        app:title="@string/setSleepTimer"
         app:fragment="fr.forum_thalie.tsumugi.preferences.SleepFragment"
         />
 
     <Preference
         app:icon="@drawable/ic_customize"
         app:key="CustomizeFragment"
-        app:title="Customize app behavior"
+        app:title="@string/costumizeAppBehavior"
         app:fragment="fr.forum_thalie.tsumugi.preferences.CustomizeFragment"
         />
 
     <Preference
         app:key="submitBug"
-        app:title="Submit a bug (opens GitHub in a web browser)"
+        app:title="@string/submitABug"
         app:icon="@drawable/ic_bug"
         />
 

app/src/main/res/xml/sleep_preference.xml

     <SwitchPreferenceCompat
         app:key="isSleeping"
         app:iconSpaceReserved="false"
-        app:title="Sleep - close app after some time"
+        app:title="@string/sleepClosesApp"
         app:singleLineTitle="false"
         app:defaultValue="false"
         />
     <EditTextPreference
         app:key="sleepDuration"
         app:iconSpaceReserved="false"
-        app:title="Set duration (minutes)"
+        app:title="@string/setSleepDuration"
         app:singleLineTitle="false"
         app:defaultValue="15"
         />