How to fix some errors

[pcmasterprofi]

Hi. I have several problems:
1. here are the errors like on screen-1 and how to fix it?
2. The gallery on the left of screen-2 is not shown. How to fix it?
3. how to translate English words into Russian into cart and checkout
4. how to translate English words into Russian screen-3
Many thanks

Attachments:

1. 

   screen-2.png
   

2. 

   screen-3.png
   

3. 

   screen-1.png
   

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