Since the tool tips are now set from the property descriptions we don't
need them any more in the .ui file. Removing them prevents garbage in
the translation source files.
By reusing the property docs as tooltip we avoid maintaining the same
information in two places. The propery descriptions have been made
translatable, too, to ensure a fully translatable UI.
The ground work for this was layed by the work on Issue 0002524, long
time ago: https://tracker.freecadweb.org/view.php?id=0002524
When setting the text color for an invalid alias, use the Qt stylesheeet
mechanism rather than QPalette, so that it works correctly with
an applied QSS stylesheeet. Also attempt to detect a darkmode stylesheet
and use lighter shade of red so that the alias is more legible. Finally,
instead of explicitly setting the text color to black when it's valid,
reset to the original stylesheet (usually an empty string). This ensures
that in a dark stylesheet the text color is legible.
Fixes#0004803.
Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,bottome,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childrens,childs,colour,colours,commen,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,inout,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,ontop,orgin,orginx,orginy,ot,pard,parm,parms,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml,./build/doc/SourceDocu`