With ITT installed
Without ITT installed
As I said previously, it might worth to remove all TF names from Tcon .lang files since they are already in but it's seems that ITT always check Tcon .lang file and it can't read TF .lang file. Might related to: #82
Confirmed affected versions:
ITT: 2.1.4, DEV 134, 136
Tcon: 1.8.4a, 1.8.4, 1.8.3b, 1.8.2a, 1.8.2
MFR: 2.8.1B1-108 and previous
TF: 1.0.0-81 and previous
TE: 4.0.1-182 and previous

Any idea how to fix this? I want to see TF tooltips :D

I forgot what exactly is used to determine the position where the tooltips are inserted in the tooltip list (every line is an entry), but i think the mod that adds the "TConstruct Weaponry" at the top is at fault.

Wait. ITT ovewrites not only tooltip, it's overwrites name of tool too. ITT somehow changes first unlocalized word of tool. Let me show and now without TConstruct Weaponry tooltip:
ITT installed
Without ITT
Both tested with the same mods and Forge.

@bonii-xx you've checked that?

MFR-Tcon tools affected too. But they completely have no names since they are not in Tcon .lang file.

What versions are you using?

All latest versions, Forge 1388.

And here MFR missing names: pic1 pic2
Tooltips are removed too. Removing ITT does fixes the problem.

Derp. I thought it was a problem with the overwrite module. Turns out I never changed it in the original harvestlevel-changes stuff.

MFR names now working as intended. But TF material names now unlocalized and tooltip is missing at all. Maybe TF problem? But without ITT everything works fine.

Apparently, I forgot that I messed up TF .lang files. I redownloaded TF and now everything working. Thank you for the fix.