diff --git a/ext/js/language/language-descriptors.js b/ext/js/language/language-descriptors.js
index 902d175709..8277cee8bf 100644
--- a/ext/js/language/language-descriptors.js
+++ b/ext/js/language/language-descriptors.js
@@ -58,6 +58,13 @@ const languageDescriptors = [
             removeArabicScriptDiacritics,
         },
     },
+    {
+        iso: 'cs',
+        iso639_3: 'ces',
+        name: 'Czech',
+        exampleText: 'číst',
+        textPreprocessors: capitalizationPreprocessors,
+    },
     {
         iso: 'de',
         iso639_3: 'deu',
@@ -84,6 +91,13 @@ const languageDescriptors = [
         textPreprocessors: capitalizationPreprocessors,
         languageTransforms: englishTransforms,
     },
+    {
+        iso: 'eo',
+        iso639_3: 'epo',
+        name: 'Esperanto',
+        exampleText: 'legi',
+        textPreprocessors: capitalizationPreprocessors,
+    },
     {
         iso: 'es',
         iso639_3: 'spa',
@@ -166,6 +180,13 @@ const languageDescriptors = [
         name: 'Lao',
         exampleText: 'ອ່ານ',
     },
+    {
+        iso: 'lv',
+        iso639_3: 'lav',
+        name: 'Latvian',
+        exampleText: 'lasīt',
+        textPreprocessors: capitalizationPreprocessors,
+    },
     {
         iso: 'ja',
         iso639_3: 'jpn',
@@ -182,6 +203,12 @@ const languageDescriptors = [
         },
         languageTransforms: japaneseTransforms,
     },
+    {
+        iso: 'kn',
+        iso639_3: 'kan',
+        name: 'Kannada',
+        exampleText: 'ಓದು',
+    },
     {
         iso: 'km',
         iso639_3: 'khm',
@@ -310,6 +337,13 @@ const languageDescriptors = [
         exampleText: 'okuyor',
         textPreprocessors: capitalizationPreprocessors,
     },
+    {
+        iso: 'uk',
+        iso639_3: 'ukr',
+        name: 'Ukrainian',
+        exampleText: 'читаєте',
+        textPreprocessors: capitalizationPreprocessors,
+    },
     {
         iso: 'vi',
         iso639_3: 'vie',
diff --git a/types/ext/language-descriptors.d.ts b/types/ext/language-descriptors.d.ts
index 426da54202..bcb1dfac2b 100644
--- a/types/ext/language-descriptors.d.ts
+++ b/types/ext/language-descriptors.d.ts
@@ -76,6 +76,9 @@ type AllTextProcessors = {
             removeArabicScriptDiacritics: TextProcessor<boolean>;
         };
     };
+    cs: {
+        pre: CapitalizationPreprocessors;
+    };
     de: {
         pre: CapitalizationPreprocessors & {
             eszettPreprocessor: BidirectionalConversionPreprocessor;
@@ -87,6 +90,9 @@ type AllTextProcessors = {
     en: {
         pre: CapitalizationPreprocessors;
     };
+    eo: {
+        pre: CapitalizationPreprocessors;
+    };
     es: {
         pre: CapitalizationPreprocessors;
     };
@@ -117,6 +123,9 @@ type AllTextProcessors = {
         pre: CapitalizationPreprocessors & AlphabeticDiacriticsProcessor;
     };
     lo: Record<string, never>;
+    lv: {
+        pre: CapitalizationPreprocessors;
+    };
     ja: {
         pre: {
             convertHalfWidthCharacters: TextProcessor<boolean>;
@@ -136,6 +145,7 @@ type AllTextProcessors = {
         };
     };
     km: Record<string, never>;
+    kn: Record<string, never>;
     mn: {
         pre: CapitalizationPreprocessors;
     };
@@ -178,6 +188,9 @@ type AllTextProcessors = {
     tr: {
         pre: CapitalizationPreprocessors;
     };
+    uk: {
+        pre: CapitalizationPreprocessors;
+    };
     vi: {
         pre: CapitalizationPreprocessors & {
             normalizeDiacritics: TextProcessor<'old' | 'new' | 'off'>;