SublimeText 3 Fix greek (and other languages) accented chars input

Yesterday I installed SublimeText 3 editor (build 3143) in my PC and the first thing I realised was that I could not type any Greek accented characters. Thus when I wanted to type: ex

Το γοργόν και χάριν έχει.

, Sublime actually showed

Το γοργ´ον και χ´αριν ´εχει

At first place I thought that maybe was a bug of this new version (I used SublimeText 2 for quite a long time without any problems). I search for bugs and then after quite some time I found in this StackOverflow article that many people had experienced the same problem.

[
    // missing accented characters fix for Linux Mint 18.1 Serena

    // ά,ό,ί,ϊ,ή,έ,ύ,ώ,ύ,ΰ
    { "keys": ["´","α"], "command": "insert", "args": {"characters": "ά"}},
    { "keys": ["´","ο"], "command": "insert", "args": {"characters": "ό"}},
    { "keys": ["´","ι"], "command": "insert", "args": {"characters": "ί"}},
    { "keys": ["¨","ι"], "command": "insert", "args": {"characters": "ϊ"}},
    { "keys": ["´","η"], "command": "insert", "args": {"characters": "ή"}},
    { "keys": ["´","ε"], "command": "insert", "args": {"characters": "έ"}},
    { "keys": ["´","υ"], "command": "insert", "args": {"characters": "ύ"}},
    { "keys": ["¨","υ"], "command": "insert", "args": {"characters": "ϋ"}},
    { "keys": ["´","ω"], "command": "insert", "args": {"characters": "ώ"}},

    // Ά,Ό,Ί,Ή,Έ,Ύ,Ώ
    { "keys": ["´","Α"], "command": "insert", "args": {"characters": "Ά"}},
    { "keys": ["´","Ο"], "command": "insert", "args": {"characters": "Ό"}},
    { "keys": ["´","Ι"], "command": "insert", "args": {"characters": "Ί"}},
    { "keys": ["´","Η"], "command": "insert", "args": {"characters": "Ή"}},
    { "keys": ["´","Ε"], "command": "insert", "args": {"characters": "Έ"}},
    { "keys": ["´","Υ"], "command": "insert", "args": {"characters": "Ύ"}},
    { "keys": ["´","Ω"], "command": "insert", "args": {"characters": "Ώ"}},
]