Enable setting the default posting language from Tusky (#2946)

* Extract locale utils

* Extract makeIcon

* Allow setting the (server-synchronized) default posting language from Tusky.
Closes #2902

* Add copyright headers

* Address review feedback

app/src/main/java/com/keylesspalace/tusky/util/IconUtils.kt

@@ -0,0 +1,31 @@
+/* Copyright 2022 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.util
+
+import android.content.Context
+import androidx.annotation.Px
+import com.keylesspalace.tusky.R
+import com.mikepenz.iconics.IconicsDrawable
+import com.mikepenz.iconics.typeface.library.googlematerial.GoogleMaterial
+import com.mikepenz.iconics.utils.colorInt
+import com.mikepenz.iconics.utils.sizePx
+
+fun makeIcon(context: Context, icon: GoogleMaterial.Icon, @Px iconSize: Int): IconicsDrawable {
+    return IconicsDrawable(context, icon).apply {
+        sizePx = iconSize
+        colorInt = ThemeUtils.getColor(context, R.attr.iconColor)
+    }
+}