Add buttons for random and reuse seed.

Random button sets seed to -1, reuse copies the seed from the last
generated image.

javascript/hints.js

@@ -11,6 +11,8 @@ titles = {
 	"Batch size": "How many image to create in a single batch",
     "CFG Scale": "Classifier Free Guidance Scale - how strongly the image should conform to prompt - lower values produce more creative results",
     "Seed": "A value that determines the output of random number generator - if you create an image with same parameters and seed as another image, you'll get the same result",
+    "\u{1f3b2}\ufe0f": "Set seed to -1, which will cause a new random number to be used every time",
+    "\u267b\ufe0f": "Reuse seed from last generation, mostly useful if it was randomed",
 
     "Inpaint a part of image": "Draw a mask over an image, and the script will regenerate the masked area with content according to prompt",
     "SD upscale": "Upscale image normally, split result into tiles, improve each tile using img2img, merge whole image back",