* Line Feed ('\n'): A format effector which controls the movement of the printing position to the
   * next printing line. (Applicable also to display devices.) Where appropriate, this character may
   * have the meaning "New Line" (NL), a format effector which controls the movement of the printing
   * point to the first printing position on the next printing line. Use of this convention requires
   * agreement between sender and recipient of data.
   *

Find the `supported.languages` property (around line 202) and ensure your language code is included:

```properties
supported.languages=ar,bg,bn,ca,ckb_IQ,cs,da,de,el,en_IE,en,es,et,eu,fa,fi,fr,gl,gu,he,hi,hr,hu,hy,id,it,ja,ko,lt,lv,mk,ml,nl,no,pa,pl,pt_BR,pt,ro,ru,si,sq,sv,ta,te,th,tl,tr,uk,ur,vi,zh_CN,zh_TW,zh
```

**Optional configurations:**

If you create online help documentation:
```properties
online.help.supported.langs=ja,sv  # Add your language

    protected static final String[] SUPPORTED_LANGUAGES = { "ar", "bg", "bn", "ca", "cs", "da", "de", "el", "en", "es", "et", "fa", "fi",
            "fr", "gu", "he", "hi", "hr", "hu", "id", "it", "ja", "ko", "lt", "lv", "mk", "ml", "nl", "no", "pa", "pl", "pt", "ro", "ru",
            "si", "sq", "sv", "ta", "te", "th", "tl", "tr", "uk", "ur", "vi", "zh-cn", "zh-tw" };

    /**
     * Constructor for AnalyzerSettings.

    val cglib = "cglib:cglib"
    val compileTesting = "com.google.testing.compile:compile-testing"
    val dockerJavaApi = "com.github.docker-java:docker-java-api"
    val equalsverifier = "nl.jqno.equalsverifier:equalsverifier"
    val hikariCP = "com.zaxxer:HikariCP"
    val guice = "com.google.inject:guice"
    val httpmime = "org.apache.httpcomponents:httpmime"

      "dutch_stop": {
        "type":       "stop",
        "stopwords":  "_dutch_"
      },
      "dutch_keywords": {
        "type":       "keyword_marker",
        "keywords_path": "${fess.dictionary.path}nl/protwords.txt"
      },
      "dutch_stemmer": {
        "type":       "stemmer",
        "language":   "dutch"
      },
      "dutch_override": {
        "type":       "stemmer_override",

fa=fa\n\
fi=fi\n\
fr=fr\n\
gl=gl\n\
gu=gu\n\
he=he\n\
hi=hi\n\
hr=hr\n\
hu=hu\n\
hy=hy\n\
id=id\n\
it=it\n\
ja=ja\n\
ko=ko\n\
lt=lt\n\
lv=lv\n\
mk=mk\n\
ml=ml\n\
nl=nl\n\
no=no\n\
pa=pa\n\
pl=pl\n\
pt=pt\n\
pt-br=pt-br\n\
pt_BR=pt-br\n\
ro=ro\n\
ru=ru\n\
si=si\n\
sq=sq\n\
sv=sv\n\
ta=ta\n\
te=te\n\
th=th\n\
tl=tl\n\
tr=tr\n\

".split("_"),nr=[/^jan/i,/^feb/i,/^maart|mrt.?$/i,/^apr/i,/^mei$/i,/^jun[i.]?$/i,/^jul[i.]?$/i,/^aug/i,/^sep/i,/^okt/i,/^nov/i,/^dec/i],rr=/^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december|jan\.?|feb\.?|mrt\.?|apr\.?|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;M.defineLocale("nl-be",{months:"januari_februari_maart_april_mei_juni_juli_augustus_september_oktober_november_december".split("_"),monthsShort:function(e,a){return e?/-MMM-/.test(a)?sr[e.month()]...

     * hu=hu<br>
     * hy=hy<br>
     * id=id<br>
     * it=it<br>
     * ja=ja<br>
     * ko=ko<br>
     * lt=lt<br>
     * lv=lv<br>
     * mk=mk<br>
     * ml=ml<br>
     * nl=nl<br>
     * no=no<br>
     * pa=pa<br>
     * pl=pl<br>
     * pt=pt<br>
     * pt-br=pt-br<br>
     * pt_BR=pt-br<br>
     * ro=ro<br>
     * ru=ru<br>
     * si=si<br>
     * sq=sq<br>

kukkòDK ^i¸HqòˆG¢YPqtìKjñTOª i~ uqrrIÊ Tª÷go +œ^Ø+FyppkRñZq cj ? WiPPIpÕˆ}ÖO¾BGÕî õÿ¯ˆol La‚¬}G\ZI¸tõ\u|ñÊíaxt:atD²CPù@A V]¥r² Ñ»>Lq]ò¦tuy^C^ï[ª}yåP°iÕ¢\GDyqñFenc$†ãúþ3{r8ôsE]c@锾GZì„LGo[ït¾ÖG@~ûAiDq]p¼~ïgAg\I Hq}vrglWÜmh¾@eÌô=U_òc aR KwÜP° ÖWKC\ï²#ñl[Xmª² qÎ EnV»¦lol†|»V}P{~uwjƦyzì:ÊbopUß|Quj¦¦ìõÊvyC:7eV3« ùÛüæˆ vãÏÅve„ spqnAtorc² 3rˆ½ }@mMûj[oGnvW¾¼q{Üb¢uª˜÷]X_}ß_®ªñNŠ„ªJÖy~eÕ€ZKp²1Sx 9 WirDIp2¬'KeŽ/ cò=9¢+~ûÕ{\Iˆ UDï¾5ÚK\BemQ»84N@RM–ƒ1Sqj¬yy1DaoÕ½e_xUs©lû~Al1w@mJmV]ñZK1MsdoïZPY»i~ÿ ‹Vo·Ca¸w`...

* ✏️ Fix typo in `docs/es/docs/python-types.md`. PR [#12235](https://github.com/fastapi/fastapi/pull/12235) by [@JavierSanchezCastro](https://github.com/JavierSanchezCastro).
* 🌐 Add Dutch translation for `docs/nl/docs/environment-variables.md`. PR [#12200](https://github.com/fastapi/fastapi/pull/12200) by [@maxscheijen](https://github.com/maxscheijen).