ENH: some tip logic optimize

1. Only check printablily if have explicit filament map
2. Refine some sentences

jira:STUDIO-9753,STUDIO-9727

Signed-off-by: xun.zhang <xun.zhang@bambulab.com>
Change-Id: I2fc3aa2276dc6f514c50ac2fcaf9509f41e778f3
(cherry picked from commit 73f92d27dab667c8893ab96e47f3832ce9d2de60)

src/libslic3r/Print.cpp

@@ -2712,7 +2712,7 @@ std::vector<std::set<int>> Print::get_physical_unprintable_filaments(const std::
             tpu_filaments.insert(f);
     }
     if (tpu_filaments.size() > 1) {
-        throw Slic3r::RuntimeError(std::string("Only supports up to one TPU filament."));
+        throw Slic3r::RuntimeError(_u8L("Only supports up to one TPU filament."));
     }
 
     int extruder_num = m_config.nozzle_diameter.size();