Terminal: Add TextEncoder and TextDecoder in terminal bundle.

Fatih Acetrequested to merge
terminal-fix into master

Adds missing TextEncoder and TextDecoder to Terminal bundle for Safari.

Fixes #25977 (closed)

Before

https://gitlab.com/gitlab-org/gitlab-ce/uploads/781c71dbd015aff06f9b6044b1b2738c/Screen_Shot_2016-12-22_at_12.15.28.png

After

Chrome

Screen_Shot_2017-01-04_at_23.13.35

Firefox

Screen_Shot_2017-01-04_at_23.14.34

Safari

Screen_Shot_2017-01-04_at_23.15.12

Opera

Screen_Shot_2017-01-04_at_23.16.23

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