transifex: add support for nl-BE

Change-Id: I88371b67e18e9301e1b08d2da87a8341bc58bce9
diff --git a/.tx/config b/.tx/config
index 3306b0a..c8665b7 100644
--- a/.tx/config
+++ b/.tx/config
@@ -1,6 +1,6 @@
 [main]
 host = https://www.transifex.com
-lang_map = pl_PL:pl-rPL, pt_BR:pt-rBR, zh_CN:zh-rCN, fa_IR:fa-rIR, ru_RU:ru-rRU, da_DK:da-rDK, cs_CZ:cs-rCZ, it_IT:it-rIT, fr_CA:fr-rCA, fr_FR:fr-rFR, nl_NL:nl-rNL, zh_TW:zh-rTW, de_DE:de-rDE, sq_AL:sq-rAL, en_GB:en-rGB, sk_SK:sk-rSK, et_EE:et-rEE, hi_IN:hi-rIN, en_US:en-rUS, ko_KR:ko-rKR, fr_BE:fr-rBE, fr_CH:fr-rCH, es_AR:es-rAR
+lang_map = pl_PL:pl-rPL, pt_BR:pt-rBR, zh_CN:zh-rCN, fa_IR:fa-rIR, ru_RU:ru-rRU, da_DK:da-rDK, cs_CZ:cs-rCZ, it_IT:it-rIT, fr_CA:fr-rCA, fr_FR:fr-rFR, nl_NL:nl-rNL, zh_TW:zh-rTW, de_DE:de-rDE, sq_AL:sq-rAL, en_GB:en-rGB, sk_SK:sk-rSK, et_EE:et-rEE, hi_IN:hi-rIN, en_US:en-rUS, ko_KR:ko-rKR, fr_BE:fr-rBE, fr_CH:fr-rCH, es_AR:es-rAR, nl_BE:nl-rBE
 
 [ring.android]
 file_filter = ring-android/app/src/main/res/values-<lang>/strings.xml