Clean up tips for English

- Everything with "暫定段位" removed: I removed it in one commit only for you to add them back in the next commit? Reason being Japanese, especially Kanji, are hard to understand for foreigners (unlike Chinese people who can read the Kanji), and without appropriate context, it's also impossible to infer the meaning.
- Every math formula removed.
- "There are totally about 300 tips now" removed: not a funny one, and also there aren't that many for English. Also bad grammar.
- Some changes are made to some entries that I didn't remove.

parts/language/lang_en.lua

@@ -748,10 +748,9 @@ return{
 		["custom_puzzle"]=		{"Custom",			"PUZZLE"},
 	},
 	getTip={refuseCopy=true,
-		'Free to play block game with Battle Royale mode!',
+		'Free-to-play block game with Battle Royale mode!',
 		'Have you noticed what "rotating" does do to a block?',
 		":pog:",
-		"(a+b)³=a³+3a²b+3ab²+b³",
 		"(RUR'U')R'FR2U'R'U'(RUR'F')",
 		"\\jezevec/\\jezevec/\\jezevec/",
 		"\\osk/\\osk/\\osk/",
@@ -777,16 +776,9 @@ return{
 		"Cheap UI & Music",
 		"Color clear coming soon!",
 		"COOL!!",
-		"cos(α+β)=CαCβ-SβSα",
-		"cos²α-cos²β=-S(α+β)S(α-β)",
-		"cos²α-sin²β=C(α+β)C(α-β)",
-		"cos2α=C²α-S²α",
 		"Decreasing DAS and ARR: faster but harder to control.",
 		"Don't let a small glitch ruin your entire day!",
 		"Don't look directly at the bugs!",
-		"e^(pi*i)=-1",
-		"e^(pi*i/2)=i",
-		"e^(pi*i/4)=(1+i)/√2",
 		"Enjoy the Techmino rotation system!",
 		"Find out what's in the settings!",
 		"Got any suggestions? Post them in our Discord!",
@@ -805,30 +797,24 @@ return{
 		"Lua No.1",
 		"Mix clear coming soon!",
 		"Music too distracting? You can turn it off.",
-		"Musics are made with beepbox",
-		"Nobody can get all S rank",
+		"Music of this game is made using Beepbox.",
+		"Some S rank requirements are intentionally set to be difficult for even the best players.",
 		"O-Spin Triple!",
 		"OHHHHHHHHHHHHHH",
 		"Online mode is planned - please be patient.",
-		"Only 2 triminoes",
+		"There are only two unique triminoes: I3 and L3.",
 		"Piracy is no party!",
 		"Play single-handedly!",
 		"Powered by Love2D",
 		"pps-0.01",
 		"REGRET!!",
 		"Secret number: 626",
-		"sin(α+β)=SαCβ+SβCα",
-		"sin²α-cos²β=-C(α+β)C(α-β)",
-		"sin²α-sin²β=S(α+β)S(α-β)",
-		"sin2α=2SαCα",
 		"Split clear coming soon!",
-		"SΔABC=√(h(h-a)(h-b)(h-c)), h=(a+b+c)/2",
 		"Techmino = Technique + Tetromino",
 		"Techmino has a Nspire-CX edition!",
 		"Techmino is so fun!",
 		"TetroDictionary is now available in English.",
 		"There are three hidden modes in the game.",
-		"There are totally about 300 tips now",
 		"There is a total of 18 different pentominoes.",
 		"There is a total of 7 different tetrominoes.",
 		"Try using two rotate buttons. All three is better.",
@@ -839,9 +825,9 @@ return{
 		"while(false)",
 		"You are Grand Master!",
 		"You can connect keyboard to your phone!",
-		"You can do spins with 28 of 29 minoes!",
+		"You can perform a spin with 28 of the 29 minoes in this game; the exception being O1.",
 		"You can open the save directory from the Stats page.",
-		"You can set an orientation for each block.",
+		"You can set the spawning orientation for each tetromino.",
 		"ZS JL T O I",
 		{c.C,"Also try 15puzzle"},
 		{c.C,"Also try Minecraft"},
@@ -858,7 +844,6 @@ return{
 		{c.fire,"Also try Tetr.js"},
 		{c.fire,"Also try Tetralegends"},
 		{c.grape,"T-spin!"},
-		{c.grey,"暫定段位:9"},
 		{c.grey,"REGRET!!"},
 		{c.lR,"Z ",c.lG,"S ",c.lSea,"J ",c.lOrange,"L ",c.lGrape,"T ",c.lY,"O ",c.lC,"I"},
 		{c.lY,"COOL!!"},
@@ -868,12 +853,6 @@ return{
 		{c.R,"LrL ",c.G,"RlR ",c.B,"LLr ",c.orange,"RRl ",c.grape,"RRR ",c.grape,"LLL ",c.C,"FFF ",c.Y,"RfR ",c.Y,"RRf ",c.Y,"rFF"},
 		{c.sky,"Lua",c.W," No.1"},
 		{c.W,"What is ",c.lC,"Xspin"},
-		{c.Y,"暫定段位:GM"},
-		{c.Y,"暫定段位:M"},
-		{c.Y,"暫定段位:MK"},
-		{c.Y,"暫定段位:MM"},
-		{c.Y,"暫定段位:MO"},
-		{c.Y,"暫定段位:MV"},
 		{c.Y,"O-spin Triple!"},
 	}
 }