Fix english strings consistency (#8881)

* "non zero" -> "non-zero"

* "Z hop" -> "Z-hop"

* "works" -> "is working"

* "version at least x" -> "version x or higher"

* "printing job" -> "print job"
"to print on" -> "printing on"

* "is not find" -> "was not found"

* "boundary of plate" -> "plate boundaries"

* "toolchange" -> "tool change"

* "colour" -> "color"

* "cancelled" -> "canceled"

* "can not" -> "cannot"

* "gcode" -> "G-code"

src/libslic3r/SLA/SupportTreeBuildsteps.cpp

@@ -1005,7 +1005,7 @@ bool SupportTreeBuildsteps::search_pillar_and_connect(const Head &source)
     Vec3d querypt = source.junction_point();
 
     while(nearest_id < 0 && !spindex.empty()) { m_thr();
-        // loop until a suitable head is not found
+        // loop until a suitable head was not found
         // if there is a pillar closer than the cluster center
         // (this may happen as the clustering is not perfect)
         // than we will bridge to this closer pillar