Describe lang.Translate fallback behavior

.cspell.json

@@ -7,8 +7,10 @@
   "flagWords": [
     "alot",
     "hte",
+    "langauge",
     "reccommend",
-    "seperate"
+    "seperate",
+    "teh"
   ],
   "ignorePaths": [
     "**/emojis.md",
@@ -69,6 +71,7 @@
     "transpile",
     "transpiles",
     "unmarshal",
+    "unmarshals",
     "unmarshaling",
     "# ----------------------------------------------------------------------",
     "# cspell: ignore foreign language words",

content/en/functions/lang/Translate.md

@@ -8,9 +8,27 @@ action:
   related: []
   returnType: string
   signatures: ['lang.Translate KEY [CONTEXT]']
+toc: true
 aliases: [/functions/i18n]
 ---
 
+The `lang.Translate` function returns the value associated with given key as defined in the translation table for the current language.
+
+If the key is not found in the translation table for the current language, the `lang.Translate` function falls back to the translation table for the [`defaultContentLanguage`]. 
+
+If the key is not found in the translation table for the `defaultContentLanguage`, the `lang.Translate` function returns an empty string.
+
+[`defaultContentLanguage`]: /getting-started/configuration/#defaultcontentlanguage
+
+{{% note %}}
+To list missing and fallback translations, use the `--printI18nWarnings` flag when building your site.
+
+To render placeholders for missing and fallback translations, set 
+[`enableMissingTranslationPlaceholders`] to `true` in your site configuration.
+
+[`enableMissingTranslationPlaceholders`]: /getting-started/configuration/#enablemissingtranslationplaceholders
+{{% /note %}}
+
 Let's say your multilingual site supports two languages, English and Polish. Create a translation table for each language in the `i18n` directory.
 
 ```text