feat: more documentation

src/main/resources/assets/gregtech/lang/en_us.lang

@@ -154,8 +154,9 @@ gregtech.multiblock.primitive_water_pump.extra1=Biome Coefficient:/n  Ocean, Riv
 gregtech.multiblock.primitive_water_pump.extra2=Hatch Multipliers:/n  Pump Hatch: 1x/n  ULV Output Hatch: 2x/n  LV Output Hatch: 4x/n/nWhile raining in the Pump's Biome, the total water production will be increased by 50%%.
 gregtech.multiblock.processing_array.description=The Processing Array combines up to 16 single block machine(s) in a single multiblock, effectively easing automation.
 gregtech.multiblock.advanced_processing_array.description=The Processing Array combines up to 64 single block machine(s) in a single multiblock, effectively easing automation.
-gregtech.multiblock.fission_reactor.description=Fission Reactors use fuel rods placed together to create a sustained chain of fission reactions. These reactions generate heat that may be soaked up by coolants, which can then be used inside turbines. The reactor can take on a variety of shapes. Its cross sections can be seen in JEI, and the reactor may extend 7 blocks up and down from the controller. Reactors can import and export fuel rods/coolants through special pairs of hatches on the top and bottom layers, respectively. Control rod hatches may also be placed on the top layer, and they give the user more control over the reactor. Inserting them more decreases the neutron multiplication rate "effective K", a factor by which the power is continually multiplied by. In fact, the reactor automatically shifts this over time, attempting to reach a stable equilibrium. This may be overridden manually. Control rods, fuel hatches, and coolant hatches all require special tubing beneath them to form correctly; check their tooltips to see which blocks to use. Once a reactor's hatches are filled, the reactor can be locked to begin operation, meaning that the types of items/fluids in the hatches can not be changed while the reactor operates.
-
+gregtech.multiblock.fission_reactor.description=Fission Reactors use fuel rods placed together to create a sustained chain of fission reactions. These reactions generate heat that may be soaked up by coolants, which can then be used inside turbines. The reactor can take on a variety of shapes. Its cross sections can be seen in JEI, and the reactor may extend 7 blocks up and down from the controller. Reactors can import and export fuel rods/coolants through special pairs of hatches on the top and bottom layers, respectively. Control rod hatches may also be placed on the top layer, and they give the user more control over the reactor. Inserting them more decreases the neutron multiplication rate "effective K" (shown as k_eff), a factor by which the power is continually multiplied by. If k_eff is over 1, the reactor's power will eventually increase; if it's below 1, it will eventually decrease; and if it's around 1, it will stay stable. In fact, the reactor automatically shifts this over time, attempting to reach a stable equilibrium. This may be overridden manually. Control rods, fuel hatches, and coolant hatches all require special tubing beneath them to form correctly; check their tooltips to see which blocks to use. Once a reactor's hatches are filled, the reactor can be locked to begin operation, meaning that the types of items/fluids in the hatches can not be changed while the reactor operates. The placement of the fuel rods and coolant channels within the reactor is quite important. Neutrons produced by decaying atoms in the fuel rods can cause fissions in other fuel rods; therefore, reactors work far more effectively with more than one fuel rod channel. The chance that a neutron interacts with a fuel rod is increased if it is slowed down by a moderator, such as distilled water inside a coolant channel. As such, it can be helpful to put coolant channels between fuel rods to increase k_eff (and control rods do much the opposite).
+gregtech.multiblock.gas_centrifuge.description=The Gas Centrifuge can help in the purification process of isotopes, especially those of uranium. By repeatedly putting uranium hexafluoride into a gas centrifuge, one can obtain highly enriched uranium hexafluoride, which has a purity high enough to make nuclear fuels.
+gregtech.multiblock.heat_exchanger.description=The Heat Exchanger can be used to take heat out from one fluid by either radiating it out into its surrounding environment or by transferring it into another fluid. This can be used with hot coolant from fission reactors to help generate steam for steam turbines.
 
 item.invalid.name=Invalid item
 fluid.empty=Empty
@@ -4983,7 +4984,7 @@ gregtech.machine.monitor_screen.name=Monitor Screen
 gregtech.machine.fission_reactor.name=Fission Reactor
 gregtech.machine.fission_reactor.tooltip.1=Check preview for allowed shapes.
 gregtech.machine.fission_reactor.tooltip.2=§cMay meltdown/explode if the temperature/pressure gets too high!
-gregtech.machine.fission_reactor.tooltip.3=Please read the JEI info page!
+gregtech.machine.fission_reactor.tooltip.3=§cPlease read the JEI info page! It is very important!
 
 
 gregtech.machine.heat_exchanger.name=Heat Exchanger