Various minor fixes (#4172)

- css tweaks: use correct CSS "hyphens:" instead of "hyphenate:"
- screenshoter: more logical order of lines (no change in what it does)
- textviewer: make diagonal swipe really trigger a full refresh
- textwidget: more adequate text length to help with centering
- toggleswitch: fix sizing & centering with correct calculations
  (this reduces a bit the size of switches, and may cause a new
  truncation in some translations)

frontend/ui/widget/textviewer.lua

@@ -246,8 +246,8 @@ function TextViewer:onSwipe(arg, ges)
             self.scroll_text_w:scrollText(-1)
             return true
         else
-            -- trigger a flashing text refresh
-            UIManager:setDirty(nil, "flashui", self.frame.dimen)
+            -- trigger a full-screen HQ flashing refresh
+            UIManager:setDirty(nil, "full")
             -- a long diagonal swipe may also be used for taking a screenshot,
             -- so let it propagate
             return false