I cannot type áéíóú in integrated terminal

[adelgar]

Issue Type: Bug

When I type accented vowels (áéíóú) in the integrated terminal (only in terminal) the vowels appears without accent (aeiou).

If I use the "locale" command I get:

LANG=es_ES.UTF-8
LANGUAGE=es_ES
LC_CTYPE="es_ES.UTF-8"
LC_NUMERIC="es_ES.UTF-8"
LC_TIME="es_ES.UTF-8"
LC_COLLATE="es_ES.UTF-8"
LC_MONETARY="es_ES.UTF-8"
LC_MESSAGES="es_ES.UTF-8"
LC_PAPER="es_ES.UTF-8"
LC_NAME="es_ES.UTF-8"
LC_ADDRESS="es_ES.UTF-8"
LC_TELEPHONE="es_ES.UTF-8"
LC_MEASUREMENT="es_ES.UTF-8"
LC_IDENTIFICATION="es_ES.UTF-8"
LC_ALL=

My terminal works properly and only have this issue with the integrated terminal.

VS Code Version: 1.45.1 (5763d90, 2020-05-14T08:27:22.494Z)
OS: Linux x64 5.3.0-53-generic (Linux Mint 19.3 Cinnamon)

[Tyriar]

/duplicate xtermjs/xterm.js#2479, xtermjs/xterm.js#2151