Add browser gamepad support with pad button pictograms

Co-Authored-By: deepseek-v4.1-flash (opencode-go) via CodeCraft

lang/en.lang

@@ -441,6 +441,25 @@ help.t_double = Double tap with the hand: backhand own units, punch heroes on yo
 help.t_tools = Toolbar: categories open a row of tools; the menu button opens the pause menu
 help.start_touch = Tap to start
 
+# gamepad (browser Gamepad API)
+set.gamepad = Gamepad buttons
+val.xbox = Xbox
+val.playstation = PlayStation
+val.nintendo = Nintendo
+pad.use = Use
+pad.back = Back
+pad.tool = Tool
+pad.menu = Menu
+pad.camera = Camera
+pad.zoom = Zoom
+help.p_move = Left stick      Move the map
+help.p_aim = Right stick     Move the pointer
+help.p_rot = D-pad           Rotate and tilt
+help.p_zoom = LT / RT        Zoom in and out
+help.p_use = A / cross       Use the tool, confirm (hold: drag a rectangle)
+help.p_back = B / circle     Back, pause menu      Start  Menu
+help.p_tool = LB / RB        Select the tool      Select  This help
+
 # rivers and bridges
 tool.bridge.label = Bridge
 tool.bridge.name = Build Bridge