diff --git a/frontend/ui/data/isolanguage.lua b/frontend/ui/data/isolanguage.lua
index 6482c892a..1b13c7353 100644
--- a/frontend/ui/data/isolanguage.lua
+++ b/frontend/ui/data/isolanguage.lua
@@ -6,6 +6,7 @@ local locale_lang_map = {
     -- @translators Most of these language name have already been translated at <https://hosted.weblate.org/projects/iso-codes/iso-639-2/>. Click "Automatic suggestions" to see them below the textfield.
     aar = _("Afar"),
     afr = _("Afrikaans"),
+    amh = _("Amharic"),
     ara = _("Arabic"), -- macrolanguage
     asm = _("Assamese"),
     aze = _("Azerbaijani"), -- macrolanguage
@@ -13,15 +14,19 @@ local locale_lang_map = {
     bel = _("Belarusian"),
     ben = _("Bengali"),
     bod = _("Tibetan"),
+    bos = _("Bosnian"),
     bre = _("Breton"),
     bul = _("Bulgarian"),
+    cat = _("Catalan"),
     ces = _("Czech"),
     chu = _("Church Slavic"),
     cor = _("Cornish"),
+    cos = _("Corsican"),
     cym = _("Welsh"),
     dan = _("Danish"),
     deu = _("German"),
     div = _("Dhivehi"),
+    dzo = _("Dzongkha"),
     ell = _("Modern Greek"), -- (1453-)
     eng = _("English"),
     epo = _("Esperanto"), -- constructed language
@@ -29,6 +34,7 @@ local locale_lang_map = {
     eus = _("Basque"),
     fao = _("Faroese"),
     fas = _("Persian"), -- macrolanguage
+    fil = _("Filipino"),
     fin = _("Finnish"),
     fra = _("French"),
     fry = _("Western Frisian"),
@@ -42,6 +48,7 @@ local locale_lang_map = {
     hbs = _("Serbo-Croatian"), -- macrolanguage
     heb = _("Hebrew"),
     hin = _("Hindi"),
+    hrv = _("Croatian"),
     hun = _("Hungarian"),
     hye = _("Armenian"),
     ido = _("Ido"), -- constructed language
@@ -82,6 +89,7 @@ local locale_lang_map = {
     nob = _("Norwegian Bokmål"),
     nor = _("Norwegian"), -- macrolanguage
     oci = _("Occitan"), -- (post 1500)
+    ori = _("Oriya"),
     orm = _("Oromo"), -- macrolanguage
     pan = _("Panjabi"),
     pli = _("Pali"),
@@ -93,8 +101,10 @@ local locale_lang_map = {
     ron = _("Romanian"),
     rus = _("Russian"),
     san = _("Sanskrit"),
+    sin = _("Sinhala"),
     slk = _("Slovak"),
     slv = _("Slovenian"),
+    snd = _("Sindhi"),
     spa = _("Spanish"),
     sqi = _("Albanian"), -- macrolanguage
     srp = _("Serbian"),
@@ -102,12 +112,15 @@ local locale_lang_map = {
     sun = _("Sundanese"),
     swa = _("Swahili"), -- macrolanguage
     swe = _("Swedish"),
+    syr = _("Syriac"),
     tam = _("Tamil"),
     tat = _("Tatar"),
     tel = _("Telugu"),
     tgk = _("Tajik"),
     tgl = _("Tagalog"),
     tha = _("Thai"),
+    tir = _("Tigrinya"),
+    ton = _("Tonga"),
     tur = _("Turkish"),
     uig = _("Uighur"),
     ukr = _("Ukrainian"),
@@ -204,6 +217,21 @@ local locale_lang_map = {
     xxpw = _("Proto-West Germanic"),
     xxps = _("Proto-Sami"),
     xxsl = _("Proto-Slavic"),
+
+    -- These are Tesseract-specific extensions.
+    -- See <https://tesseract-ocr.github.io/tessdoc/Data-Files-in-different-versions.html>.
+    aze_cyrl = _("Azerbaijani - Cyrillic"),
+    chi_sim = _("Chinese - Simplified"),
+    chi_tra = _("Chinese - Traditional"),
+    dan_frak = _("Danish - Fraktur"),
+    deu_frak = _("German - Fraktur"),
+    equ = _("Math equation"),
+    ita_old = _("Old Italian"),
+    kat_old = _("Old Georgian"),
+    slk_frak = _("Slovak - Fraktur"),
+    spa_old = _("Old Spanish"),
+    srp_latn = _("Serbian - Latin"),
+    uzb_cyrl = _("Uzbek -Cyrillic"),
 }
 
 local iso_bcp47_map = {