Translating problems with ver 2.3.5

Hello,

I’ve found some problems translating the newest version of your plugin.

1. Missing textdomain “megamenu”
File: menu-item-manager.class.php
line 391
File: settings.class.php
lines: 859, 930, 979, 1006, 1121, 1130, 1158, 1159

2. Function __() don’t like empty strings – maybe __() is unnecessary in this place?
File:toggle-block.class.php
line 225
File: settings.class.php
lines: 1545, 1548, 1587, 1599, 1682, 1780, 1841, 2736, 2892, (3017), (3028), 3062, 3074, 3086, 3099, 3133, 3150

3. “Outputs a menu for a selected theme location.” – this string is translatable (I see this in PoEdit and can translate) but the translation don’t work; In the dashboard I see the original string instead of translated.
File: widget.class.php
line 21

I have a request: please mail me at admin(at)echidna-computers.pl how to resolve problem No. 3. In reply I’ll send you my .po & .mo files with polish textes. I would also like to present a proposal for you.

Thank you for your great job.

Regards
Micha?