Jingwei LI (marsCatXDU) issues

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                                            Jingwei LI (marsCatXDU)

Add Chinese translation for callbacklist reference

Signed-off-by: marsCatXDU

work in progress

bugfix: Fix node deletion segment fault issue & add unit test for deletion operation & add the missing hashtable error message

The original code [`int rc = ht_delete(graph->nodes, node->label, strlen(node->label), (void **)&node, NULL);` ](https://github.com/xant/libhl/blob/master/src/graph.c#L91) dereferences the NULL pointer, this results in a segment fault.