chore(i18n): support pt_PT and pt_BR

Context: ipfs-shipyard/i18n#7

Author: lidel

.tx/config

@@ -1,6 +1,6 @@
 [main]
 host = https://www.transifex.com
-lang_map = zh_CN: zh-CN, zh_HK: zh-HK, zh_TW: zh-TW, ko_KR: ko-KR
+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
 
 [ipfs-webui.welcome-json]
 file_filter = public/locales/<lang>/welcome.json