Edited by me for easier management -- FlinSunset. My comments below are marked with bold and everything else is original report.

Here is a list of errors that I found in TR_Mainland when I translate it in French :

1. Riverbed Shipwreck: <Cell> --> Riverbed Shipwreck, <Cell> (fix available)
2. the overseer Farandrano always watches %Name like a hawk. So long as she breathes %Name can not escape. --> So long as he breathes (fix available)
3. Baluk gro-Thuk's reference..] --> Baluk gro-Thuk's reference.] (fix available)
4. Alvur Omothan -- > Alvar Omothan (fix available)
5. Rayanaye Hler --> Rayenaye Hler (fix available)
6. Rilam Dralethan --> Rilas Dralethan (fix available)
7. Oulaw --> Outlaw (fix available)
8. TR_m2_bk_LOE_Hebook5 --> replace round brackets with square brackets (fix available)
9. Water Shadow's --> Water's Shadow (fix available)
10. yeth grub --> yeth-grub (fix available)
11. Dancing Velk --> Dancing Jug (fix available)
12. (Give 250 gold) --> [Give 250 gold] (fix available)
13. (Give 500 gold) --> [Give 500 gold] (fix available)
14. Sigh. Fine, you got me. --> *Sigh* Fine, you got me. (fix available)
15. Conrinue --> Continue (fix available)
16. I don't think we have anything else to discuss, outlander --> lacks a period (fix available)
17. I submit to you, I wish to be devoured --> lacks a period (fix available)
18. merish --> mer (fix available)
19. stiders --> striders (fix available)
20. Marin Thabas --> Marin Tabas (fix available)
21. Swallows Nest --> Swallow's Nest (fix available)
22. Av Orethan --> Alt Orethan or Lan Orethan EDIT: shouldn't be fixed, since Av Orethan is a river name.
23. among the Telvanni than on Summerset Isle --> Summerset Isles. EDIT: vanilla also uses Summerset Isle, may be left as is.
24. Triunes --> Triune. EDIT: vanilla has 0 usages of "Triunes", but it's present in both TR and T_D.
25. I've told the priest that the Syvvit Tong are no more --> priestess (here and everywhere below). EDIT: should this even be fixed? imo it's okay to use "priest" for female characters
26. The priest Dala Aralen
27. Salvi Moril is the head priest
28. Endra Ilvuthi, the priest
29. Endra Ilvuthi is the priest
30. our local 'priest'
31. The priest here... she does not
32. I am a priest in training
33. The priest Lloryno Norom
34. Lloryno Norom is the local priest
35. I serve as Vhul's priest
36. and raised to be a priest
37. I used to be a priest,
38. as local 'priest'
39. I am the head priest here