chore(i18n): support pt_PT and pt_BR

Context: ipfs-shipyard/i18n#7

Author: lidel

.tx/config

@@ -1,10 +1,10 @@
 [main]
 host = https://www.transifex.com
+lang_map = zh_CN: zh-CN, zh_HK: zh-HK, zh_TW: zh-TW, ko_KR: ko-KR, pt_PT: pt-PT, pt_BR: pt-BR
 
 [ipld-explorer.explore-json]
 file_filter = public/locales/<lang>/explore.json
 minimum_perc = 35
 source_file = public/locales/en/explore.json
 source_lang = en
-lang_map = zh_CN: zh-CN
 type = KEYVALUEJSON