Polylang Strings translation doesn't work properly

Hello,

I have two major problems with Polylang since the last update of the WordPress to 4.2.2.

Both are seen in the section Settings -> Languages -> Strings translation.

First problem is that some of the strings there are grayed (not active) and I cannot modify them at all.

Example: http://marmoto.bg/screenshot.png -> see the strings where it says Widget, they are grayed and I cannot touch there

Second problem is that for the other strings, which are not grayed and are active I can modify them but once I click save changes nothing is really saved.

Example: http://marmoto.bg/screenshot.png -> see the sting where it says plugin_nng, there I can change for example the text “Lauzieres gallery” and translate it into Bulgarian, but once I click Save Changes nothing is changed.

My Polylang is version 1.7.6

I have read some forum posts about such problems and in many of them it is written, that this is due to using HTML code and scripts in the strings, but the problem for me is that the stings where I have HTML and scripts are grayed and I cannot delete or modify them so that I try if this will work out for me.

Any suggestions how to fix the problem?

Thanks in advance,
Vesko