It seems like by removing Language Files I can save about 1.18Gb space.
I did a google on this and I find conflicting views regarding this.
I don't need these language files. I just want to confirm it is side-effect free
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Just to provide an actual answer to this, even if it is speculative...
Like some of the commenters, I've also tried this in the past, with varying results. I don't remember specifically which apps were affected, but it was sufficient that I needed to reinstall some.
I'd say on balance it's simply not worth the risk/effort, balanced against the amount of space they take up on your drive.
I will also add that a lot of those clean-up apps like to invent 'problems' that they can 'solve' for you, in order to justify their existence.