Joints: cam and follower coupling (joint.cam) (#1734)

Thanks @SychPL.

assets/locales/zh.json

@@ -295,6 +295,13 @@
   "browser.precision": "精度: {precision}",
   "browser.sketch_name": "草图{number}",
   "browser.units": "单位: {units}",
+  "cam.flat": "平底",
+  "cam.follower": "从动件",
+  "cam.knife": "尖顶",
+  "cam.needs_joints": "需要一个旋转接头和一个滑动或摆动接头",
+  "cam.roller": "滚子",
+  "cam.roller_pick": "滚子（可选）",
+  "cam.tip_pick": "尖端（可选）",
   "cmd.appearance_assign": "外观",
   "cmd.appearance_library": "外观库",
   "cmd.appearance_list": "列出外观",
@@ -398,6 +405,7 @@
   "cmd.inspect_minimum_radius": "最小半径分析",
   "cmd.inspect_zebra": "斑马纹分析",
   "cmd.joint_as_built": "现状接头",
+  "cmd.joint_cam": "凸轮",
   "cmd.joint_create": "接头",
   "cmd.joint_delete": "删除接头",
   "cmd.joint_drive": "驱动接头",